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Ladder and tourney great ideas. Best of all would be ELO style rankings - ive seen this work many times before, and it would definitely give you the best players, as it does for chess, backgammon and other games.
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http://en.wikipedia.org/wiki/Elo_rating_system )
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If people are interested in this, then I don't think it would be all that hard to get something like this going (perhaps even the whole thing could be browser based?).
The only two things I can think of that would possibly put people off are:
a) Playing lots of hands for no $ (but since its for practice anyway, I can't see that being such a huge problem).
b) Honesty reporting the results and playing out the games (if it was all browser based, then this wouldn't be a problem and could be handled server side).
Juk [img]/images/graemlins/smile.gif[/img]
EDIT: It might even be possible to adapt the PokerSource Server & GTK Client code to do this without much effort.