this has been up for less than a week, and it's getting huge..

http://scenehd.net/

and this one rocks too:
http://hdbits.org/

(If you want an invite

www.mIRC.com
to get an irc client

The server is
irc.p2p-network.com
The channel is
#hdbits

to join simple type in any line

/server irc.p2p-network.com -j #hdbits)