I've just started a Tumblr account and will be publishing some pics over there, until I buy a new proper camera.
Go have a look at Elise's musings.
Tumblr is a mix of Facebook, Twitter and blogging. Very easy to blog some photos, texts, share links, etc, but you don't have as much space as on a "traditional" blog where you can decide to write a 500 lines long article (bad idea if you want readers, but that's another story). You still have more than 140 characters, so it's not Twitter, and photos are apparent. It's close to the Facebook status news feed, you just don't have the other part of Facebook (messages, instant messaging, social gaming, etc...).