I havn't experienced any slow loading issues myself with any of the screenshots yet - although my cab runs Mamewah on a P3 1gig with 512MB of RAM and I use a 19" computer monitor

Normally I keep the resolution of the snaps in whatever they were created in - ie. whatever the emulator saves them as. This gives the best quality snaps in my opinion, which people can then resize from there themselves as you guys suggested above.
As for the latest snaps, I only did the N64 ones, so I'll only comment on those, but I found most of the snaps were in 320x240 so I just kept them that way. They weren't all the best quality, but it was easier downloading them than creating them! I may however go back and do these myself (like my other sets) if I get the time later on.
Oh, and Howard, I'd like to thank you again for the artwork renamer, it has come in very handy! Especially with snaps grabbed from the net

- although it seems to have an issue with sequal games, ie. named "mortal kombat", "mortal kombat 2", "mortal kombat 3" the snaps will just use the shot of "mortal kombat" for all??