Juan Gonzales, Planet Eye.  Some very cool clustering and visualization for travel based geography.  You can share your own travel data and photos on a really nice Flash web map.  There is some very smart clustering going on as well.  To build some of their data, Planet Eye is doing some serious crawling to scrape GeoData and effectively index it.  Planet Eye has also developed a proprietary technology for maintaining an efficient GeoIndex regardless of the size of the database.