Any other Mudcatters using "Flickr". It's "a photo organising/sharing service" and I found it through an enthusiastic piece the other week in the Guardian - here is a link to the article, and that explains how it works better than I can.

And here is a link to Flickr. Very neat and open-ended.   It's commercial, but not excessively so - there's a reasonable free non-paying members and visitors get a reasonably fair deal. I see it's Canadian. That figures.

It's based on a tag system - here's a set of pictures I found through typing "folk" in the tag search. (And here's a link to some photos I have put up.)