Well, normally I'd suggest (or agree with) an A/V forum. But given that there's an existing Echo Vale, and it already does a good job, perhaps the new forum should be sort of its visual counterpart -- a Photo/Video forum. So you'd have photography stuff, but also HDTV, video cameras, outboard tuners, STBs, etc. (Video cards obviously still belong in the appropriate mfr forum).
Can't think of a witty title to parallel Echo Vale, however.
And I agree: there are plenty of free picture hosting sites; the only advantage TR might see is additional adviews, but it probably won't pay for all the necessary added storage. So folks can just use any of the free ones. On sites like Flickr that support tagging, you could even add a "TechReport" tag and create a shared pool (these can be public or private) -- some sites actually pull pictures from Flickr based on their tag -- see the *st blogs like Seattlest