You can create a free trial account on ForPhotos.net or sync to any compatible server. You could actually set up your own server to do this because they've provided a spec for the photo transfer XML-RPC interface. Very cool.
I tried it out with a couple of pictures from a Giants game last month and it worked quite well (Brian's Palm Photos). Their software takes the notes from the picture to form the caption once posted to the web, creating a pretty good PhotoBlog solution.