Wow - this is so cool! In addition to photo sharing and photoblogging, now you can EASILY geotag all your Flickr photos and put them on the map! 
 
This feature was just added in September. I am just beginning to explore classroom uses for geotagging, so this is just a "get started" how-to... 
 
If you are not sharing photos on Flickr yet, you should try it out! It's fun and useful for sharing photos with family and friends if nothing else - AND it's free!.  
 
http://www.flickr.com