Only one i can think like that is/was POTUK, btw thats how BCG was for about a 3 days before the hosts took us down and reported the bill payer (not me, co-founder of POTUK) to the cops.
but that is pretty easy to do believe it or not, the harder part is what we done, tracker and forum.
EDIT: its easier because you just have the members on the forum, you never let the members see the tracker, so they dont need to join it, you just have the torrents going into the torrents directory, where the tracker pics it up and then the forum starts listing the seeders and leechers. The way we do it, we have both the tracker and forum, so you have to bridge them together, so members are on both, which is a bitch to code.
you can even do it with xbtt without a php tracker by the looks of it
http://xbtt.sourceforge.net/ipb2_mod/
I am not sure where the code is for that but a google search should bring it up.
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