-Changed serializing ISerializable types under partial trust to error to fix security issue
-Fixed LinqBridge collision error in .NET 2.0 by moving types to a different namespace
-Fixed JObject.Keys error when object has no items
-Added support for serialization event attributes on base classes
-Changed WriteEndObject, WriteEndArray, WriteEndConstructor on JsonWriter to be virtual
-Added StreamingContext to JsonSerializer
-Added CreateMemberValueProvider method to DefaultContractResolver
-Fixed not falling back the original class from the metadata class when attribute not found
-Added IValueProvider, ReflectionValueProvider, DynamicValueProvider
-Added Dynamic.snk
-Added Required enum with options Default, AllowNull and Always
-Added serialization event support to Silverlight version
-Added Converter to JsonProperty for JsonConverter
-Changed IsRequired to Required enum
-Changed schema generator to allow for Required enum options
-Changed Silverlight project version to Silverlight 3
-Improved error message when JSON array encountered for object and vice-versa when deserializing
-Improved error message for converting types when deserializing
-Improved error message from getting and setting properties when serializing and deserializing
-Fixed empty string being converted to null when deserializing
-Removed dependency on Entity Framework and LINQ to SQL assemblies
-Changed OnError to be available in .NET 2.0, Silverlight and Compact Framework builds
-Added StreamingContext stand-in for frameworks where it isn't available
-Split test classes out of JsonSerializerTests
-Fixed decimals to always be written with a decimal place
-Replaced IMappingResolver with IContractResolver
-Renamed JsonMemberMapping to JsonProperty
-Added JsonContract, JsonObjectContract, JsonArrayContract, JsonDictionaryContract
-Added support for OnSerializing, OnSerialized, OnDeserializing, OnDeserialized callback methods
-Major refactoring of serialization internals
James Newton-King