I stumbled across this website tonight while searching out information on seeing outflow boundaries on satellite images and it appears to be promising. The links section appeared to have quite a few interesting sites. Also, I saw a bunch of really cool images of cloud structures.
http://www.brockmann-consult.de/CloudStructures/index.htmADDED: I saw some pictures on this site that I would love to have framed and hang up in my living room. Amazing shots from above.