You may have seen the recent announcement of the preview release of Google App Engine, a way to run web applications on Google's infrastructure. Google App Engine makes it easier to get a new app off the ground, and also makes it easier to scale later on when your your business or organization grows. For Google Apps customers, you can associate your application with your domain, restricting the app's usage to your organization.
Currently, this is a preview release, which means there are limitations in terms of the CPU, bandwidth, and storage that an app can use, limitations that equate to around 5 million pageviews/month for a typical app. But we encourage you to try it out -- Google App Engine is open to the first 10,000 developers who sign up.
We're hoping to get as much feedback as possible during this preview phase. If you have particular features you're really interested in seeing, please let us know.