MSDN "Roslyn" Dev Center
http://go.microsoft.com/fwlink/?LinkID=228399

Microsoft "Roslyn" CTP
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=27746

Walkthroughs: Microsoft "Roslyn" CTP
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=27745

The Roslyn Project - Exposing the C# and VB compiler's code analysis, October 2011
http://msdn.microsoft.com/en-us/hh500769

[docx] Whitepaper: Roslyn Project Overview
http://www.microsoft.com/download/en/details.aspx?id=27744


Forum
http://social.msdn.microsoft.com/forums/en-us/roslyn


Blogs on Roslyn CTP:

S. Somasegar
http://blogs.msdn.com/b/somasegar/archive/2011/10/19/roslyn-ctp-available-now.aspx

Eric Lippert
http://blogs.msdn.com/b/ericlippert/archive/2011/10/19/the-roslyn-preview-is-now-available.aspx

VS Team
http://blogs.msdn.com/b/visualstudio/archive/2011/10/19/introducing-the-microsoft-roslyn-ctp.aspx

C# Team
http://blogs.msdn.com/b/csharpfaq/archive/2011/10/19/introducing-the-microsoft-roslyn-ctp.aspx

VB Team on Roslyn CTP
http://blogs.msdn.com/b/vbteam/archive/2011/10/19/introducing-the-microsoft-roslyn-ctp.aspx