The First Coulds oriented Studio (SDK).

Aptana Studio. http://www.aptana.com/

Easy to deploy your applications, but only 7 days for free. I move to Google App Engine after that.
Eclipse also provide deployment tools for Google App Engine.
http://code.google.com/intl/zh-TW/appengine/articles/eclipse.html


Happy Googling.

The First Compute Cloud I found...

Amason EC2, http://aws.amazon.com/ec2/ should be the one, but
Of course, Google should be the number one provider in free. I'm using their App Engine to make one.
But what kinds of applications are suitable for compute clouds?

Name one if you can leave a comment. Thanks