they changed nothing except for the stickers i just got a 06 36 and that is the only diffference from the 05. fox emailed me with information that says for doesent change thier products every year because when they come out with the product it is the best it could ever become
They were intending to change the hydraulic bottom out rings to smoother bushing type thingies... Not sure if that has made it to the '06 production.
Thing is, Fox suspension makes running changes to their model lineup as and when they see room for refinement. A lot of it is not very apparent. Especially when they change internals. For example, the '05 RP3 rear shock and the '06 one has almost completely different shim piston design, yet they are exactly similar externally.