It would be nice if there was a possibility of creating and using a database. As far as I know (and I don't know much, mind you), using the console is either necessary, or makes it much easier, to create, say, an sqlite3 db. Another feature request would be the ability to upload images or static resources but I get how space and security can be an issue in that case. Oh and one last tidbit, "guarnatee" is not a word (welcome.html) ;)
Other than that, I really appreciate the simplicity of it all, the ability to download the package after you're done especially. Great job, mitsuhiko!