The following articles may be of interest to you:
http://blogs.msdn.com/sqlserverstorageengine/archive/2008/12/21/tempdb-basics.aspx
http://blogs.msdn.com/sqlserverstorageengine/archive/2008/12/22/tempdb-basics-cont.aspx
Paul
Paul White
SQLPerformance.com
SQLkiwi blog
@SQL_Kiwi