I used to play with controls inverted, but after I played my one of my first PC FPS (Star Trek: Elite Force 2, although I had played Heretic and Hexen before EF 2 ) I went to standard and never went back.
[quote name='sying']I don't invert. Up means up and down means down, its what God intended. Only time when I invert is when I play flying games[/quote]
wtf.
Inverted - it's natural. Noninversion makes me disoriented.
Non-inverted in first person games, inverted in third person games.
Games that switch between views always seem to handle it properly, probably because moving the control down in third person is lowering the camera, therefore raising the view.