We have used Rackspace (
http://www.rackspace.com) for a lot of our dedicated server hosting for years without complaint. When they bought Mosso (the cloud company) we tried it out. We'd already been researching and testing other cloud services, and the pricing and fact that it's Rackspace, made the service very attractive. Unfortunately, we had a few not so great experiences with their cloud, and the lack of a robust administrative control panel left me generally feeling not-so-impressed with the service (Amazon, on the other hand, has a great control panel). Today, Rackspace announced the release of a new API for Rackspace Cloud, and I intend to take a second look. Based on the information I've read so far, it sounds pretty nice. Hopefully I won't be let down, as it'd be great to be able to consider Rackspace among the good quality cloud services available. You can check out Rackspace Cloud online at
http://www.rackspacecloud.com/.