I keep my photos on flickr, which let’s me share them conveniently with friends. Flickr has always been a fun place per se, and has spawned several creative initiatives. For example the collected photos of ’round stuff’ have been printed on a high quality poster: I have a photo of mine on it as well.
Now I found a new game called fastr based on flickr, which asks you to guess a tag associated with a group of photos, assigning you points based on how fast you are. The game is played against others, and it is very addictive. Could be also a nice tool for learning simple English words. I have to try it with my kids.