I've never really been a fan of ResEdit for production. I'd rather use Rez directly - which I think Apple still ships and should create compatible resource forks.
Hey Jim,
What was the change?
Hey everyone else,
Greg Parker (now at Apple as the objc runtime guru) has written a Mac OS X wrapper for Lunatic Fringe, although I haven't tried it yet:
http://www.sealiesoftware.com/fringe/
It would be fairly trivial to get the original after dark 2.0...