Howard,
Something else that would be nice for you to compile -- It's no secret that MAME screenshots are readily available, but it seems that screenshots for other emulators are never available.
It would be nice to have packages of official screenshots for other emus, named after Cowering's GoodXXXX scheme, so frontends which match a romname with a screenshot would automatically recognize them.
Most emus at least offer ability to take screenshots, some sites even collect snaps from SNES and the like, so it would be nice to come up with correctly named collections.
Even if we each took a letter or something and did them by hand, it's something I bet a lot of people would love.
Brad