What's a good Brightness/Contrast/Gamma util?

How do,
Using ubuntu 6 at the moment, fresh install, so still setting things up.
I've got a really dark monitor that needs adjustment... so something that's easy to load on startup would be great.
I previously used some random util I found on google, but it wasn't that great.
Do you have any specific reccomendations?

Also, does anyone know what the deal is with getting my nVidia control panel (or similar) in linux? (ie. being able to set filtering quality, etc.)
Or if such a thing exists, it could probably do the gamma correction aswell?

Any info appreciated.