National Geographic had an article on GeoRSS a while ago, a good read. Plus there are some good surprises at their online series: Digital Places.
As you probably know by now, Google Maps (and Earth) accepts coordinates in formats like:
There is now a dedicated Geographical Search Engine at Geody (thanks Stefan). A similar if not the same syntax can be applied with results that will give you a lot to look for in a clean interface.
Map24, Mapsolute, MapTP
I ran into Map24 a while ago and now again with the news that mobile support has been added .
"Map24 Mobile 2.0 [...] shows routes in North and South America, the Middle East, Australia and New Zealand [and Europe]."
Try their Ajax interface by drawing rectangles over the US map. Neat.
New Map Provider?
Looking under the hood you discover that Mapsolute (signing side by side with NavTeq as a map data provider) has a role similar to deCarta in US, a German-based company that launched Map24.com as a portal available now "with localized content for fourteen countries."
Its map data provider technology is called MapTP and it: "distributes vector maps through the net, sending them compressed and incrementally."
Poking on C++ coders: "animated zooms and pans in Java, even faster [than] C++ painters."
Map data is provided by TeleAtlas, NavTeq and AND (yes, AND maps).
API's are provided for Java and C++. ActiveX components will be replaced by .Net and web services "interfaced by XML, HTTP or PHP."
news article that took me into this track. Tricky.