got a great tool to monitor the site.. i work for the company and its one of my 'products' i do pre-sales consulting for..
http://www.bmc.com/siteangel/
i use my account for monitoring sites that are of interest to me.. i leave one 'angel' for setting up to monitor the clients site that i am doing a prez for.. the other one i am pointing this way.. it looks at teh performance/availablity of a recorded transaction (angel) in what we call steps... (each page click is a step)
will get it going and toss you a url to login and view once i get some meaningful data.. also, any page/url that you are most interested in monitoring other than the obvious default first page?