opengameart.org and similar sites.

So, while trying to get some add ons for gimp, I found opengameart.org and wanted to know what you guys thought of it, though of course, I don't mean to take attention from this site.  It seems like there is a lot we could potentially take advantage of there and perhaps share with there.

I've recently get from there some city backgrounds from here (ones by Alucard), because they have kind of Knyttish look, so I think it might be useful site. However, I am not planning to upload there something or join them.