I started to use Flickr to upload my images, so I want to introduce about this site.
Flickr seems to be generally a site for the photograph opening to the public, but it can also upload some graphics on it. And when you upload images to Flickr, you can also apply License to your images. (There are six of Creative Commons License.)
I think Flickr is a good place to arrange and distribute the image on the network.
Making account is free but when you create account, you also need Yahoo! account.
http://www.flickr.com/
11-Aug-2006