Fast, Scalable, and Secure Session State Management for Your Web Applications

http://msdn.microsoft.com/msdnmag/issues/05/09/sessionstate/
http://msdn2.microsoft.com/en-us/library/ms178586(vs.80).aspx
http://support.microsoft.com/kb/325056
http://www.velocityreviews.com/forums/t121630-sql-session-state.html