Same here. Actually I tried penumbra overture a while back on Linux (but it seems the games have been ported again ? So maybe corrected ?). I must admit I didn't really enjoy it because I never found how to open the kind of hatch in the snow, and died of cold, after 5 minutes of game... And it was kinda laggy on my laptop at this time, with a crappy i945.
Anyway I'll try it again, and like kungfujesus even if I don't like it again, supporting Linux gaming is definitely worth 5$