Believe it or not, the Smash Bros Dojo!! was updated on August 22nd. I happened t just find this out of boredom, but the update is pretty neat. What the team did was, utilizing the internet I assume, was create a database of Home-Run Contest and Target Smash records according to character. It gives you a good idea of who's better or worse at what events.
Target Smash Records as of July 2008
Home-Run Contest Records as of July 2008
So we don't get leaderboards in game, but we get a seemingly random (albeit generic) update on the game's site 5 months after release ... awesome. I wonder if there were any other updates I may have missed? .. nope!