Your next geo app is going to be easier to build. Instead of running your own database and collecting geographic data yourself, you can build on top of TownMe and its newly-launched read/write Geo API (tech details at our TownMe API profile).
Everywhere you look, there's a map mashup for just about any recognized monument. Yet, those looking to find the location of graves in the U.S. Arlington National Cemetery won't find such a mashup. There are some things that come close, but nothing that utilizes a mapping API. What's more, it seems the cemetery itself is stuck in the past when it comes to organizing its own information.
For months, the Bing Maps site has been showing off what are essentially embedded mashups. You can search nearby tweets, FourSquare check-ins and other content from partners. Until now, it was merely a showcase of apps either written internally or by a company that Microsoft had blessed. Now, you have the opportunity to get your mashup included on Bing's map.