The best of the Zero Edition of D&D clones out there. Almost feels like the mid 1970's Chain Mail game.
PCs are either Fighting Men, Clerics, or Magic Users, that's it. Everyone can look for traps, attempt to disarm traps or pick locks so a rogue specialist class is superfluous. Rangers and Knights are just versions of Fighting Men and Paladins are versions of Clerics, and that's only if the GM even permits them via a house rule.
Rolls are only via d20 and d6, no need for a 10lb dice bag! (Did you read that Darin? ;p )
My group has been playing S&W:WB for just about five months and all of us thoroughly enjoy the simplicity of this very basic hack n' slash dungeon crawl system.