1. The rest of earth please :)
2. Ad layers to the map, News, Public service, Public, Wikipedia, etc
3. Integrate with NASA World Wind
4. Let users ad info, let it become the world biggest guestmap! Add a chaoslayer where anyone could mark their spot. Old spots fade out if the area is crowded.
5. Integrate with Picasa/Hello by creating a googlemap-bot a la bloggerbot, and ad mappointchooser to Picasa and Hello. In Picasa this would be a great service because it would let us organize pictures by geography!