This thread from late last year may be of some intrest to you. Piotr has not been active in the forums since but his monitor site is still up and running. It's pretty good and well worth a look for some ideas.
http://x10hosting.com/forums/off-topic/140344-x10hosting-server-monitor-created-piotr-grd.html
http://x10hosting.com/forums/off-topic/140344-x10hosting-server-monitor-created-piotr-grd.html