With Mercator.swc you may create amazing geo apps in Flash/Flex that do not reload data.

The component contains all countries of the world and additional 8000 cities + the corresponding latitude and longitude.

There're also some demos available here

Please note: Ignore the CC licence in the header of the source files! It is fully LGPL!

Mercator.swc can be skinned in every way and has a programming api.

For a good start I also recommend the Guide to amazing maps