I like Flickr for this forum and I use Photobucket for other forums and for the Proboards forum I run.

I started with flickr to share pictures with family and had them all load family pictures that I could download for a 'photo frame' for my parents. But the community there is excellent. I love the Commons and I sometimes get lost in Flickr going from one image to the next. The exif data is certainly helpful in learning how some of the images were achieved.

I recently learned that the club I work at has hundreds of old historical black and whites and I have been begging them to load them onto flickr. (Maybe I should volunteer)