EVE Online, the internet spaceship game that puts all of it's players into one virtual universe, recently announced plans to license and monetize its EVE Online API. The proposed license would allow developers to make money from apps using the API in return for an annual fee. The details of the new licensing program were released by game developer CCP shortly after it's annual fanfest in Reykjavik, Iceland. EVE's player community quickly attacked parts of the license, prompting CCP to suspend the changes until later this summer when some of the concerns can be addressed.
Once you get beyond the most basic map mashups, you'll run into a problem with data storage and access, because you can't hard-code hundreds of markers. It's a problem that SimpleGeo wants to fix. And from the looks of their new platform, they've gone beyond expectations.