Pingdom offer a commercial web site monitoring service, they also offer a free monitoring solution that you can join, GIGRIB.

Pingdom GIGRIB is a unique, distributed website monitoring service. GIGRIB users can add websites they want monitored, and in return their computers become a part of the GIGRIB monitoring network.

A while back I setup the GIGRIB client on the only Windows PC in the house and it seemed to run ok. I was contributing several thousands of checks a day to the project and monitoring a couple of sites I was interested in.
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