A new iOS app called Flock (not the web browser) finds the photos you take together with friends and family and neatly syncs them based on timestamp etc into a single shared album. I assume it works for iPhone, latest iPod Touch and iPhone.
Flock relies on location information to do its magic, but doesn’t suck your battery dry, apparently. Flock also relies on Facebook to learn who your real friends are, but says it will never post anything without your explicit approval. Just be cautious of privacy as with all of these apps and Facebook itself, of course.