Computer now is offering digital video surveillance for home or businesses.
This Digital Video Recorder (DVR) will allow you to view your home or business from any web browser 24/7 and record any activities within.

Here is a live sample view http://tonynow.dyndns.org/video/Pages/AllCameras.aspx

Below are some pricing:

Intel Pentium 4 Dual Core with  2.6 gig 512 RAM and 300 gig HD with 4 Cameras and video card.
Total price $1995, this price does not includes installation fee and cable. Cable run are extra and depend on the degree of difficulty and price could be vary.