I saw something that's useful for all of us. This is called Google App Engine. Right now, it's open only to few accounts but it looks promising from it's description :
Google App Engine is a platform for building and hosting web applications on Google Web Servers. It was first released as a beta version in April 2008. During its preview release, only free accounts are offered. According to Google, a free account can use up to 500 MB of persistent storage and enough CPU and bandwidth for about 5 million page views a month. Google has also indicated its intention to eventually provide additional resources for a price. During the preview stage, Google App Engine tries to accommodate sudden surges in traffic, but errors will occur if the quota continues to be exceeded. (http://en.wikipedia.org/wiki/Google_App_Engine)
Isn't it cool ? I can use the same platform where my Gmail is hosted and same technology that they are using. That's seems pretty cool for me.. Only thing is it only supports Phyton.. for now...
Try it out at : http://code.google.com/appengine/