There are tons of ways to share photos (and videos) on the web. I currently use three main sites to share my photos, each for different reasons.
Picasaweb – I’ve been using google’s photosharing the longest, largely because I didn’t want to deal with getting a yahoo id. Which isn’t that tough. I like the album nature of picasaweb, and put most of the photos that I take onto there, treating it like as a bit of a cross between a backup and a social network.