WARNING: The Google Maps tool/mashup/app that you are about to read about is extremely cool. Please be seated and clear time from your schedule before proceeding. :) It also seems to only be viewable in Firefox presently..
Wikimapia is a new project created by Alexandre Koriakine and Evgeniy Saveliev aimed at "describing the whole planet earth". They have created an excellent way to accomplish this goal. Using a mixture of Google Maps satellite imagery, a "wiki" editing mechanism and tagging, Wikimapia lets anyone add or edit a description for any place on earth (without registering). It also provides a new, unique way of browsing Google Maps satellite images. Here are some examples:
Male, the capital of Maldives:
Wikimapia presents itself in a multilingual fashion with interface controls available in English, Russian, French, Spanish, Italian, German, Chinese, Japanese, Korean and Portuguese languages! Honestly, screen captures from this site don't do it justice.. Get in and have a play and you'll realize the full potential and how nice and easy it is to use. This one gets the "awesome" label from Google Maps Mania for top notch interface, great idea, and concept stikiness. The only thing lacking is the Internet Explorer interoperability.