I think it's all of "In Music Brands".
The Get satisfaction Akai forum has been retired as well. I have an Akai MPC Live and was a frequent visitor over there as well as the Alesis site.
I would expect, but haven't looked yet, that the Numark, M Audio, Sound Switch, Ion, Sonivox, Rane, Marantz, MarQ, MixMeister, HeadRush, Air, Alto, Denon DJ and Denon Professional Get Satisfaction forums have all been retired as well since these are all In Music Brands properties.
Powerhouse