Hypercam: Records well on old computers, records badly in general.
Camstudio: The CS codec can be used on any program, which is nice. CS itself is records jerkily on any computer, though. Open Source AFAIK.
Fraps: Records great, but can crash your computer if it's crap. RAM hog.
Taksi: Records like shit, doesn't work with anything, doesn't record sound AT ALL (yet). Open Source, though, but does it matter?
External camera of some sort: No use of system resources, quick, easy. Crap quality all round. Tacky.
I haven't used any other recorders.