Microsoft have released a SharePoint 2007 best practices analyser. They say :
The Microsoft Best Practices Analyser for Windows SharePoint Services 3.0 and the 2007 Microsoft Office System Best Practices Analyser 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