Can I state the obvious first competitor: Web hosting. It's dirty cheap, has SQL, supports basic scripting python, perl, and some support even C cgi. Typical accounts have 20+GB and even more GB on daily transfers.
The main drawback is it doesn't scale, but you can move things to S3 or App Engine if you really need to. Use client-side processing with AJAX, CDN, etc.
Google's lock-in architecture isn't tempting for starters unless you plan to have a massive number of visitors.
The main drawback is it doesn't scale, but you can move things to S3 or App Engine if you really need to. Use client-side processing with AJAX, CDN, etc.
Google's lock-in architecture isn't tempting for starters unless you plan to have a massive number of visitors.