You may have noticed I’ve mentioned the photohosting site Flickr quite a bit. I like it a lot for a number of reason, but mainly, because of their open nature, people make cool apps with it.
Geobloggers Map-Shows where you’ve taken photos juxtaposed on a Google Map (you have to input the geography data yourself though)
Mappr Map-Another mapping service, easier to use, not nearly as accurate
Mappr Example
Flickr Graph-an interactive graph of your friends
Flickr Graph example
There are probably other ones I haven’t seen yet. By the way, they’re also giving away free stuff.