Someone, I can't remember who, was really annoyed by the default behaviors of the mac keyboard application switching (open-apple + tab) and today i came across this software review:
http://www.softpedia.com/reviews/mac/LiteSwitch-Review-17728.shtml if it was you, here, give this one a shot - 30 day trial, $15 if you end up liking it. the reviewer did.