I am playing Labyrinth Lord right now, a retro-clone of B/X D&D and it is super fun

That said I wasn't happy with 3.5 and 3.75 isn't thrilling me at all. 4e can just get out of the conversation IMHO.

But like I said, good for Paizo. They have become the new TSR as far as I can see, which is exactly what the gaming world needed after WotC.