SQL Server 2005 Best Practices Analyzer (July 2007)
Although the summer (which we have not seen much of in Belgium the last 2 weeks) has started, Microsoft is still on a roll.
Check out the new SQL Server 2005 Best Practices Analyzer here.
By the way, for those of you who have not bought SQL Server 2005 Practical Troubleshooting: The Database Engine, it is really a must read for every SQL Server DBA. Apart from troubleshooting information it also contains a lot of 'inside' information about how SQL Server 2005 works, I just love that stuff but maybe that's just me :-)
*EDIT*
A nice blog post here.