I set up a Google Group for anyone who wants to drill down on the idea of hosting an apps contest for any and every city in the world. The group's home page is at http://groups.google.com/group/apps-for-everywhere If you're interested in working through it, helping decide if it's a workable idea, and figuring out how to make it really great, drop in and sign up.
Or feel free to write a reply to yesterday's thread, if you'd rather.
I will post periodically to Discussions and the Main Group about the idea if it continues to grow. But a Google Group will allow anyone interested to talk as much as they want without bothering the others on this list.