Otter Bar Kayak does a kayaker trip in September. I talked to them, and the 2006 trip should be on, but they don't have firm info yet. I think that this years trip is full. They basically get all the spots from a G.C. outfitter to run raft support and fill all the spots (25 or so?) on that permit with kayakers, or a few folks who want to ride the rafts. They used to do Oar rig raft support, but now do motorized raft support. The cool thing about this trip is that the trip stops to play at good spots, and they have an experienced Grand kayaker on the trip to help with lines for the more difficult rapids if you want some Beta. Its not an instructional trip though... I think its a great opportunity for the potential Grand Kayakers that can get the time off to do the 21 or 28 day private trips (if you are lucky enough to find someone who has a permit).
I am planning on going next year...