Something for Microsoft Developers…

TEN Tools For Developer 
http://msdn.microsoft.com/en-us/magazine/cc300497.aspx#S6

Silver Light 
http://msdn.microsoft.com/en-us/library/bb404700(v=VS.95).aspx

Data Access Application Block 
http://msdn.microsoft.com/en-us/library/ms954827.aspx

Enterprise Library 4.1 
http://www.microsoft.com/downloads/details.aspx?FamilyID=1643758B-2986-47F7-B529-3E41584B6CE5&displayLang=en

.Net Framework 3.5 features and capabilities here are some interesting documentation sites to get started:

WCF: http://msdn.microsoft.com/en-us/netframework/first-steps-with-wcf.aspx

LINQ: http://msdn.microsoft.com/en-us/netframework/aa904594.aspx

Entity Framework: http://msdn.microsoft.com/en-us/data/aa937723.aspx

Web Services.: http://msdn.microsoft.com/en-us/library/yzbxwf53.aspx