I knew it wouldn't be long before we start seeing the ability to deploy to the clouds directly from the IDE. The folks at Aptana seem to be leading the pack on this one. Check out this very cool demo of Aptana Cloud. It was sent to me by Kent Langley. It not only lets you deploy to the cloud directly from the IDE (Aptana Studio), it keeps your local project synched with the cloud deployed project. It also comes as an Eclipse Plug-In.
The folks at Aptana have set it up so that you can play around with this without actually giving you credit card info. I also understand that the underlying cloud they are currently using is Joyent.