I was contemplating writing a site for appengine/python so I immediately jumped at trying this out. My biggest concern was that I wanted to be able to download the code when I was done, so I was glad to see it was an option to do just that. My ideal would be making that a git repository I could push or pull from. I also tried to use the site in Opera. I understand it's probably not common, but both editors seem to be broken. I think it would be a really good idea for this IDE to optionally integrate with webapp and hide away some of the framework-specific boilerplate behind slick interfaces.