from the SharePoint Team Blog:

“Microsoft Best Practices Analyzer for Microsoft® Windows® SharePoint® Services 3.0 and the 2007 Microsoft® Office System” has Shipped!

The Microsoft Best Practices Analyzer for Windows SharePoint Services 3.0 and the 2007 Microsoft Office System Best Practices Analyzer (BPA) programmatically collects settings and values from data repositories such as MS SQL, registry, metabase and performance monitor. Once collected, a set of comprehensive ‘best practice’ rules are applied to the topology.
Administrators running this tool will get a detailed report listing the recommendations that can be made to the environment to achieve greater performance, scalability and uptime.

You can get a copy here: http://www.microsoft.com/downloads/details.aspx?familyid=cb944b27-9d6b-4a1f-b3e1-778efda07df8&displaylang=en

Bill Baer from MS IT includes more detail on the release in this post.

(The same team that brought you the WSS 3.0and MOSS 2007 MOM packs were responsible for this.)