diff --git a/AppKit/CPPasteboard.j b/AppKit/CPPasteboard.j
index e1f44b31a..ad66df335 100644
--- a/AppKit/CPPasteboard.j
+++ b/AppKit/CPPasteboard.j
@@ -233,7 +233,7 @@ var CPPasteboards = nil,
 */
 - (BOOL)setPropertyList:(id)aPropertyList forType:(CPString)aType
 {
-    return [self setData:[CPPropertyListSerialization dataFromPropertyList:aPropertyList format:CPPropertyListXMLFormat_v1_0 errorDescription:nil] forType:aType];
+    return [self setData:[CPPropertyListSerialization dataFromPropertyList:aPropertyList format:CPPropertyList280NorthFormat_v1_0] forType:aType];
 }
 
 /*!
@@ -244,7 +244,7 @@ var CPPasteboards = nil,
 */
 - (void)setString:(CPString)aString forType:(CPString)aType
 {
-    [self setData:[CPKeyedArchiver archivedDataWithRootObject:aString] forType:aType];
+    [self setPropertyList:aString forType:aType];
 }
 
 // Determining Types
@@ -343,7 +343,7 @@ var CPPasteboards = nil,
     var data = [self dataForType:aType];
     
     if (data)
-        return [CPPropertyListSerialization propertyListFromData:data format:CPPropertyListXMLFormat_v1_0 errorDescription:nil];
+        return [CPPropertyListSerialization propertyListFromData:data format:CPPropertyList280NorthFormat_v1_0];
         
     return nil;
 }
@@ -355,7 +355,7 @@ var CPPasteboards = nil,
 */
 - (CPString)stringForType:(CPString)aType
 {
-    return [CPKeyedUnarchiver unarchiveObjectWithData:[self dataForType:aType]];
+    return [self propertyListForType:aType];
 }
 
 /* @ignore */
@@ -429,7 +429,7 @@ var DOMDataTransferPasteboard = nil;
     var dataString = _dataTransfer.getData(aType);
 
     if (aType === CPStringPboardType)
-        return [CPData dataFromPropertyList:dataString format:kCFPropertyList280NorthFormat_v1_0 errorDescription:0];
+        return [CPData dataFromPropertyList:dataString format:kCFPropertyList280NorthFormat_v1_0];
 
     return [CPData dataWithEncodedString:dataString];
 }
@@ -439,7 +439,7 @@ var DOMDataTransferPasteboard = nil;
     if (aType === CPStringPboardType)
         return _dataTransfer.getData(aType);
 
-    return [CPPropertyListSerialization propertyListFromData:[self dataForType:aType] format:CPPropertyListUnknownFormat errorDescription:nil];
+    return [CPPropertyListSerialization propertyListFromData:[self dataForType:aType] format:CPPropertyListUnknownFormat];
 }
 
 @end
diff --git a/Foundation/CPException.j b/Foundation/CPException.j
index 26d89aa85..5aa4e3fd2 100755
--- a/Foundation/CPException.j
+++ b/Foundation/CPException.j
@@ -200,3 +200,8 @@ function _CPRaiseInvalidAbstractInvocation(anObject, aSelector)
 {
     [CPException raise:CPInvalidArgumentException reason:@"*** -" + sel_getName(aSelector) + @" cannot be sent to an abstract object of class " + [anObject className] + @": Create a concrete instance!"];
 }
+
+function _CPReportLenientDeprecation(/*Class*/ aClass, /*SEL*/ oldSelector, /*SEL*/ newSelector)
+{
+    console.warn("[" + CPStringFromClass(aClass) + " " + CPStringFromSelector(oldSelector) + "] is deprecated, using " + CPStringFromSelector(newSelector) + " instead.");
+}
diff --git a/Foundation/CPPropertyListSerialization.j b/Foundation/CPPropertyListSerialization.j
index 342a55257..4f37b3179 100644
--- a/Foundation/CPPropertyListSerialization.j
+++ b/Foundation/CPPropertyListSerialization.j
@@ -33,14 +33,32 @@ CPPropertyList280NorthFormat_v1_0   = kCFPropertyList280NorthFormat_v1_0;
 {
 }
 
-+ (CPData)dataFromPropertyList:(id)aPlist format:(CPPropertyListFormat)aFormat errorDescription:({CPString})anErrorString
++ (CPData)dataFromPropertyList:(id)aPlist format:(CPPropertyListFormat)aFormat
 {
     return CPPropertyListCreateData(aPlist, aFormat);
 }
 
-+ (id)propertyListFromData:(CPData)data format:(CSPropertyListFormat)aFormat errorDescription:({CPString})errorString
++ (id)propertyListFromData:(CPData)data format:(CPPropertyListFormat)aFormat
 {
     return CPPropertyListCreateFromData(data, aFormat);
 }
 
 @end
+
+@implementation CPPropertyListSerialization (Deprecated)
+
++ (CPData)dataFromPropertyList:(id)aPlist format:(CPPropertyListFormat)aFormat errorDescription:(id)anErrorString
+{
+    _CPReportLenientDeprecation(self, _cmd, @selector(dataFromPropertyList:format:));
+
+    return [self dataFromPropertyList:aPlist format:aFormat];
+}
+
++ (id)propertyListFromData:(CPData)data format:(CPPropertyListFormat)aFormat errorDescription:(id)errorString
+{
+    _CPReportLenientDeprecation(self, _cmd, @selector(propertyListFromData:format:));
+
+    return [self propertyListFromData:data format:aFormat];
+}
+
+@end
diff --git a/Foundation/CPURLConnection.j b/Foundation/CPURLConnection.j
index ed9502382..627aba30e 100644
--- a/Foundation/CPURLConnection.j
+++ b/Foundation/CPURLConnection.j
@@ -278,16 +278,16 @@ var CPURLConnectionDelegate = nil;
 
 @implementation CPURLConnection (Deprecated)
 
-+ (CPData)sendSynchronousRequest:(CPURLRequest)aRequest returningResponse:({CPURLResponse})aURLResponse error:({CPError})anError
++ (CPData)sendSynchronousRequest:(CPURLRequest)aRequest returningResponse:({CPURLResponse})aURLResponse error:(id)anError
 {
-    CPLog.warn("[CPURLConnecton sendSynchronousRequest:returningResponse:error:] is deprecated, using [CPURLConnecton sendSynchronousRequest:returningResponse:] instead.");
+    _CPReportLenientDeprecation(self, _cmd, @selector(sendSynchronousRequest:returningResponse:));
 
     return [self sendSynchronousRequest:aRequest returningResponse:aURLResponse];
 }
 
 - (HTTPRequest)_XMLHTTPRequest
 {
-    CPLog.warn("[CPURLConnecton _XMLHTTPRequest] is deprecated, using _HTTPRequest instead.");
+    _CPReportLenientDeprecation(self, _cmd, @selector(_HTTPRequest));
 
     return [self _HTTPRequest];
 }
diff --git a/Objective-J/CFPropertyList.js b/Objective-J/CFPropertyList.js
index eeadb3e99..6def3e086 100644
--- a/Objective-J/CFPropertyList.js
+++ b/Objective-J/CFPropertyList.js
@@ -332,7 +332,7 @@ var _plist_traverseNextNode = function(anXMLNode, stayWithin, stack)
     return NULL;
 }
 
-CFPropertyList.propertyListFromData = function(/*Data*/ aData)
+CFPropertyList.propertyListFromData = function(/*Data*/ aData, /*Format*/ aFormat)
 {
     return CFPropertyList.propertyListFromString(aData.encodedString(), aFormat);
 }
@@ -566,30 +566,30 @@ exports.kCFPropertyList280NorthFormat_v1_0   = CFPropertyList.Format280North_v1_
 
 exports.CFPropertyListCreateFromXMLData = function(/*Data*/ data)
 {
-    return CFPropertyList.createFromDataWithFormat(data, CFPropertyList.FormatXML_v1_0);
+    return CFPropertyList.propertyListFromData(data, CFPropertyList.FormatXML_v1_0);
 }
 
 exports.CFPropertyListCreateXMLData = function(/*PropertyList*/ aPropertyList)
 {
-    return aPropertyList.createDataWithFormat(CFPropertyList.FormatXML_v1_0);
+    return CFPropertyList.dataFromPropertyList(aPropertyList, CFPropertyList.FormatXML_v1_0);
 }
 
 exports.CFPropertyListCreateFrom280NorthData = function(/*Data*/ data)
 {
-    return CFPropertyList.createFromDataWithFormat(data, CFPropertyList.Format280North_v1_0);
+    return CFPropertyList.propertyListFromData(data, CFPropertyList.Format280North_v1_0);
 }
 
 exports.CFPropertyListCreate280NorthData = function(/*PropertyList*/ aPropertyList)
 {
-    return aPropertyList.createDataWithFormat(CFPropertyList.Format280North_v1_0);
+    return CFPropertyList.dataFromPropertyList(aPropertyList, CFPropertyList.Format280North_v1_0);
 }
 
-exports.CPPropertyListCreateFromData = function(/*PropertyList*/ aPropertyList)
+exports.CPPropertyListCreateFromData = function(/*CFData*/ data, /*Format*/ aFormat)
 {
-    return CFPropertyList.createFromDataWithFormat(aPropertyList);
+    return CFPropertyList.propertyListFromData(data, aFormat);
 }
 
-exports.CPPropertyListCreateData = function(/*PropertyList*/ aPropertyList)
+exports.CPPropertyListCreateData = function(/*PropertyList*/ aPropertyList, /*Format*/ aFormat)
 {
-    return aPropertyList.createDataWithFormat(aPropertyList)
+    return CFPropertyList.dataFromPropertyList(aPropertyList, aFormat);
 }