Here are some rakeback directories:
www.rakebacknetwork.com (they also have a support forum here at 2+2)
www.rakecommunity.com
http://rakeback.wedoitallvegas.com
www.rakebreakers.com
I'm not sure Rakebackdepot is even still in business. I only see two sites on it. I'm sure I've missed a directory somewhere too.