Uninstall Safari 4 on OS X?

Awhile back, I installed the safari 4 developer preview. Now I need safari 3 back.

Safari 3 won’t install because “a newer version is already installed on the system.” Besides dragging the app to the trash, what support files do I need to blitz to get the Safari 3 installer to run?

Are there any tools that will automate the process? Preferably free.

of note, I’ve already dragged safari 4 to the trash and emptied the trash