#5 flickr

I found Flickr quite easy to use, and I was able to sign up quickly by using a pre-existing yahoo email account. I then used Flickr's blogging tool to add the image straight to the blog. I've used photobucket before (to upload photos and images to use as an avatar for a message board), but Flickr looks like it may be a more flexible tool. Until now I assumed that photo sharing sites were just for fun, but I can see the potential for building communities and the exchange of information using the visual medium here, given what libraries are doing with Flickr.