Photobucket is what a lot of people use, but they have started taking down your stuff if you don’t regularly go to the site. I like flickr.com. That’s where all of my photos are, and I like the fact that I can share them with other photographers and they can make comments etc.
Here’s another vote for Flickr.com.
and Flickr.com uses your yahoo log-in info so no new username and password combo to remember (unless you don’t have a yahoo acct)