Thumb, and incidentally, mine is remapped to Alt/Meta for better Emacs support. I'm not a big fan of the Apple key layout either, but the reason I use an Apple keyboard with Emacs in Cygwin is that it just feels right. Maybe it's because I've been using laptops for such a long time, but something about the pitch and the tactile feedback just seems to hit a sweet spot. Plus, I guess compared with the other HP, Dell and Logitech crap we have around the lab, it's probably the best option (at least for me).
