DisplayConfigX gives you a wide range of resolutions and sets them to whatever your monitor supports (auto detected, if your monitor supports EDID 1.2). If you want 100Hz resolutions or if the default resolutions aren't enough, this is your tool. Provides pretty much arbitrary resolutions (depending on your hardware). Works with most decent vga monitors and graphic cards. Supports DVI monitors and HDTV style devices.
Version 1.0.9: Optionally keeps default resolutions.
Mac OS X 10.2 or later, multi-scan monitor.