Using Crossover Games (link: http://www.codeweavers.com/products/cxgames/) I've got Garry's Mod working (along with the Orange Box.) So far all I've been doing is running around gm_bigcity nuking zombies. I've got a lot of addons but not Wiremod, because I'm too lazy to figure out how to get the SVN working on Mac. Anyone else got this awesome game?
I don't know about Gary's mod, but a bunch of us play TF2 now, your welcome to ad me on steam, ma username is JordanPE
I've played Garry's Mod 9 and it wasn't spectacular. I dunno about the newer versions.
If you wanna backstab me a few times in TF2, my steamid is aeriaglorismpc.