Jimmy May has compiled a great white paper on Disk Partition Alignment Best Practices for SQL Server along with Denny Lee

http://msdn.microsoft.com/en-us/library/dd758814.aspx

This is a must read for anyone configuring a disk subsystem for SQL Server.

Jimmy must be going for an award for good performance blogging articles along with two other good references

DMV All Stars
http://blogs.msdn.com/jimmymay/archive/2008/10/30/drum-roll-please-the-debut-of-the-sql-dmv-all-stars-dream-team.aspx

Wait Stats Introductory Reference
http://blogs.msdn.com/jimmymay/archive/2009/04/26/wait-stats-introductory-references.aspx