This is, hands down, the best WBFS Manager for Linux in my opinion:
http://code.google.com/p/linux-wbfs-manager/
The only way that it could be improved is to allow the adding of multiple ISOs at a time. There was originally a thread for this WBFS Manager but I can't find it anymore.
if they get permission from 4j (the studio who helped put minecraft on consoles), they could put the console edition tutorial worlds in the game, as seeds
and i mean all of them (if not, maybe a few highlights, like TU1, TU31, and TU69)