Don't solve that problem too well

Apple's preview of their "Time Machine" feature in Mac OS X Leopard asks,

Ever deleted something you wish you hadn't?

And so Time Machine is a built-in version control system with a gratuitous graphical interface. But if Time Machine works too well, the next question I'll be asking is, "Ever deleted something, thought it was gone, but didn't realize that past revisions still existed in your Time Machine repository?"

I think a good solution would be to modify the "Secure Empty Trash" function in the Finder to remove every revision of the trashed documents in question from the repository.