[What I read today] Asp.Net Session
http://msdn.microsoft.com/en-us/library/ms972429.aspx
http://adventuresdotnet.blogspot.com/2009/06/aspnet-moving-session-out-of-process.html
http://msdn.microsoft.com/zh-cn/library/ms178586(VS.80).aspx
http://support.microsoft.com/kb/325056