CVertex

.NET Domain-Driven Design with C#: Problem-Design-Solution
Amazon SES SMTP Server
AutoMapper
BlogML .NET
C# Linear Hash Table
Email Sender Library for .NET
Expression Blend Rasterizer Add-in
F# cross-platform packages and samples
Facebook C# SDK
Foursquare for Windows Phone 7
Googleman
Html Agility Pack
ILMerge-GUI, the .NET merger
jPageFlipper
LINQ to Lucene
Microsoft Spain - Domain Oriented N-Layered .NET 4.0 Sample App
Mobile Device Browser File
MVC Controls Toolkit
MvcContrib: an Outer Curve Foundation project
NuGet