Some great exercises for the butt, probably a bit better than squats, would be back leg extentions and pulses.

Get onto the floor on all fours and stretch 1 leg out at a time and bring it back. Do one side at a time. After you're done with the extensions, go straight into pulses - extend your leg back again and bend your knee so your foot is toward the sky, then push up, and push up, and push up, etc. That has to be one of the best that I have found.

Also, table top planks.. pretty much a reverse plank on all fours (on hands, not elbows) with your stomach toward the sky, and stay there for at least 30 secs... or as long as you can go, be sure to push through your heels.
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