Rob, hope you see this in time! Free versions of a supposedly good commercial WINE distrib that ordinarily isn't free. Crossover and Crossover Games, and both Linux and Mac versions.
I did sign up in time, although I'm not sure what it's going to do that Wine can't. If it runs games better, then I'd be pleased. There's still a lot under Steam I can't run in Linux... just the simplest of games work. Will make a post about it once I'm able to spend some time with it.