Catalogue|e-business magazine reported today that Snow Valley has partnered with Site Confidence to provide monitoring for their client's sites.
Moneyspyder have done this for over two years. For Free. Coupled with Pingdom for a back up. Engineyard run their own in house server monitoring in addition. For Free.
Using these services mean that Moneyspyder can honestly claim to have 99.9% uptime or better for all sites for as long as we have been running.