Sites with "Power User Forums".

I think every tracker has restricted forum threads for eg staff and uploaders.
ScT has for uploaders :P

FST I win!

BitSoup me thinks.

BiT-HDTV and FileList off the top of my head in addition to already mentioned trackers.

Bitspyder

BitHQ has a power user corner and an extreme users playground.

F*** as well.

Thanks guys.