[via Todd Bleeker's 60 Hive]
Watch Todd’s blog for an article that will explain his many recommended changes to the ONET.XML file.
The new ONET.XML file contains details about how a new Site will be provisioned when it is first created. It is located in the XML folder of our new Site Definition (\60\TEMPLATE\1033\STS2\XML\ONET.XML). I am working on an article that will include a Site Definition that can be download and used in place of the built-in STS Site Definition. Watch for it here.