Well, this is a bit difficult to answer (note that I did not say it was a hard one.) I have all mine in a subtree, but that includes submission-sized jpgs, bmps, thumbnail jpgs, and parameter files. A right-click and Properties on that folder shows 4215 files in 77 folders, totaling 2.77 GB. If I just search for *.jpg and limit it to files larger than 2 KB, I get a much more reasonable 1800 or so files. I've been doing this for just over two years, and I've done at least a few images in about 10 programs.