Mike Fanning, Krzysztof Cwalina, and Brad Abrams were awarded with the Engineering Excellence Chairman's Award for the design of FxCop, which is given for contributions that Bill Gates considers extremely important:
The Engineering Excellence Chairman's Award is Microsoft's highest award for engineering group employees worldwide. This award recognizes and rewards individuals that have pioneered noteworthy innovations in their drive for engineering excellence. Receiving the Engineering Excellence Chairman's Award is a level of recognition that only a few of our finest employees achieve.
This is an awesome achievement and something that they all deserve. Congratulations!
Krzysztof has more information on his blog: http://blogs.msdn.com/kcwalina/archive/2007/07/03/EEAward.aspx