flagrantdisregard.com keeps a running list of the top 100 digital cameras that are attributed to pictures on Flickr. The list is recompiled each week and the rankings updated. With as many users as there are on Flickr, you wouldn’t think that the rankings would change very often.
The Canon EOS Digital Rebel XT is in the top spot up from spot 2 last week while the Nikon D50 is in spot 2 down from spot 1 last week. I would imagine that those two are the most used and as a result they switch back and forth depending on who took more pictures each week. The rest of the list is a pretty good indicator of what could be up and coming models and might be a good way to select your next digital camera.