Patriot - 640x480 is good quality but when you research cameras - don't look just at resolution - look at the frames-per-second. The ATC2K camera (pictured in the first post) will do 640x480 at 30fps which is good... most others only give you half that at 320x240 at 15fps.

This camera recording at 640x480 at 30fps will use 512MB every 15min - so you can get 1 hour per 2 GB card. They're cheap so get a few to last you a while. However - it is NOT compatible with SDHC cards so anything bigger than 2GB won't work.

This is good camera but you'll get your highest quality videos from a bullet camera and recorder setup - these are significantly more expensive though. I use both and they have their trade-offs.