Those are great archives (and I am a member of that site, somehow I never found that second CD, the search on that site is pretty bad).
My primary aim is for single-game, self booting NEO4ALL discs. The reason is that they are a little easier to just throw in and play with kids (got to keep the next generation honest and loving/respecting the DC
I have found a few here and there... I think one of the things I can do is actually put them up on a file share or something somewhere, so it's easier for the next (new) community member to get these great titles.
I think the SNK titles are awesome for quick "pick up" games.