Just to go with bofh, we use aximcams as well. They have a really cool piece of software to do 2x2, 3x3, 4x4 fullscreen on monitors if you have lots of cameras. It records either permenantly or on motion detection.
We've had them for coming upto a year now and have found them quite impressive.
I wish someone would just call me Sir, without adding 'Your making a scene'.
Rob