Google hasn't been just a search engine for a long time. In addition to Gmail (which I use), Orkut (friend of a friend software), Picasa (photo organization), and Froogle (online shopping index), they've been upgrading their Maps feature like crazy. Recently they've added the ability to view a map or a satellite view and opened the API (to help programmers) which resulted in at least one amazing hack.
The other amazing thing has shown up on Flickr after inspiration from Matt H. (of Metafilter fame). MemoryMaps (flickr pool) show marked up versions of personal history such as childhood neighborhoods and famous places. You might want to do your own.