Taboo Saves You From Yourself
Taboo, from Obsessive Compulsive Development, is the hack many of us have been waiting for. It does two things... it provides a warning before quitting or closing a Safari window that has multiple tabs open and it lets you disable those annoying warning messages that Safari now presents when downloading a file which contains an application. Those of you afraid of wanton widgets won't want to do that, but I'm a brave soul.
It works great for me in Tiger. I haven't tested it in Panther, so proceed there at your own risk.
Me likey.