-Added support for DataMemberAttribute's EmitDefaultValue
-Fixed losing decimal precision when writing JValues
-Fixed error when calling ToList on empty JObjects and JArrays
-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
-Improved JsonSerializer to cache contract/converters where possible to improve performance
-Improved JsonTextReader error message when additional JSON content found
-Fixed internal exception thrown when deserializing Decimal/DateTimeOffset/Byte lists
-Fixed various JsonTextReader bugs
-Fixed JObject loading JSON with comments
-Fixed error when using a Specified property with no setter
-Fixed transient constructor error on Windows Phone 7
-Fixed deserializing null values into nullable generic dictionaries
-Changed .NET 3.5 and .NET 4.0 builds to target client frameworks
-Fixed JSON Schema not raising an error for additional properties when the schema has no properties
-Updated main project to .NET 4.0
-Updated to psake 4.0
-Changed assembly version to 4.0.0.0
-Added ICustomTypeDescriptor implementation to JObject, removed JTypeDescriptionProvider and JTypeDescriptor
-Changed serialization of collections to use iterator rather than indexer
-Removed Compact Framework project
-Fixed XML documentation warnings
-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 BsonReader, BsonWriter
-Added support for reading and writing byte arrays to JsonReader, JsonWriter and LINQ to JSON classes
-Added ReadAsBytes to JsonReader
-Changed Silverlight build serializer to look for a TypeConverter
-Changed .NET build to not rely on System.ComponentModel.DataAnnotations assembly to support .NET 4.0 client profile
-Remove DateTimeOffset stand-in from Compact Framework build
-Fixed .NET 2.0 build to run on environments without .NET 2.0 SP1
-Fixed deserialization to always use a new value created from a JsonConverter
-Fixed XmlNodeConverter to support converting comments in JSON
-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 many bugs around JProperty and JObject
-Changed JProperty constructor that doesn't take a value to internal
-Added many unit tests
-Renamed CloneNode to CloseToken
-Changed JPropertyDescriptor to always return the token rather than value
-Move test serialization objects to TestObjects namespace
-Fixed JsonConvert to always write a floating point number with a decimal place
-Changed Type values to serialize and deserialize to type name string
-Fixed JsonWriter to allow objects and arrays to be written in a constructor
-Added JsonContainerAttribute with Id, Title and Description members. JsonObject and JsonArray inherit from this attribute
-Added JsonArrayAttribute. Has flag to control whether array can contain null items.
-Added IsRequired to JsonProperty
-Replaced protected method GetSerializableMembers with GetMemberMappings on JsonSerializer
-Fixed QuoteChar not getting set when parsing property name
-Added Load(JsonReader) to JProperty, JConstructor
-Fixed error when populating JProperty with content from collection
-Added the ability for JsonTokenWriter to write individual values as well as arrays and objects
-Added CreateReader to JToken
-Added FromObject to JToken
-Added ReadFrom to JToken
-Improved error message on JObject and JArray Load method
-Added WriteRawValue
-Added missing XML documentation
-Added SerializeObject overload that takes a formatting flag
James Newton-King