What screen capture apps for OS X exist as alternatives to Fraps?
My suggestions:


iShowU HD – great app, can record in-game videos, records both microphone and system app, compress video and still fast; $29.95.
QuickTime – records audio only from system input, supports in-game screen capture, slower then iShowU HD, but still smooth, free and built-in.
Krut – Ugly interface, very buggy.
Screeny – No demo available; $14.99