Uh? have you used the new "revert to saved"" function in Lion (found in preview)? You can browse differend versions of your edits just like in time machine. Try it out.
I dont know if its good or bad yet...its differend workflow thats for sure.
Yes I only thought of it after using Time Machine, still it's the same thing as using TM. It's just downright annoying and a waste of time to have to go back. I want to save when I want, not when the OS wants to.