What Lisp dialect should I learn?
plinkplonk: The "learning well" of a dialect is more important  than agonizing over choosing any particular dialect. Pick  one at random and write some large (5k to 10k line) programs in it. Read some programs written by great programmers who use that dialect.The knowledge you gain will transfer very easily into the dialect you choose next (and you will get more informed by then and won't have to ask in forums).