SharePoint diagnostic tool fully supported by MS. Just in case you have not used it or seen it
Creates a cab file you can upload to MS or just extract and read the raw data. Mainly it’s a number of text files regarding the entire server (Must run on each server in the farm for best results)
Limited on 2008 Server, but works great for everything including search errors and issues.
If you really want to know what’s going on on your SharePoint farm SPSReport is your friend.