If you have installed (or are in the planning stages of installing) SP2 on any of the SharePoint Server 2007 based products (this includes Form Server, Search Server, Project Server, etc) then you NEED to head over to the SharePoint Team Blog and take notice of an issue that has been found.  The post on the issue is at

http://blogs.msdn.com/sharepoint/archive/2009/05/21/attention-important-information-on-service-pack-2.aspx 

The short version is that the SP2 install has an issue with the activation date – this will not affect any data or settings, but can affect your SLA’s if you haven’t taken the action described in the article.