If you're considering "cloud computing", you should also check out Joyent. (http://www.joyent.com/ http://www.joyent.com/) They're different than Amazon EC2, th

If you're considering "cloud computing", you should also check out Joyent. (http://www.joyent.com/ http://www.joyent.com/) They're different than Amazon EC2, though... rather than just being able to scale up by adding additional virtual servers, your servers are also "burstable" up to the maximum physical capabilities of the physical machines. Pretty cool stuff. I just got an Accelerator for my in-progress Facebook-powered site, so we'll see how it turns out. (By the way, Facebook applications get free entry-level Accelerators...)