I just finished solving a fun little puzzle on the Lostpedia Blog. (Yes, I'm one of those people.)
I owe what cryptogram skills I have to Poe's "The Gold Bug" and Fours Crossing by Nancy Garden. Both stories had me solving the cryptograms in the local paper when I was a kid. (In the evenings after Jeopardy!, of course.)
Thanks to Lost for helping me relive a bit of my childhood...
By the way, their book club is currently reading Carrie (a live chat will happen on the 23rd, but this discussion thread is interesting). Lord of the Flies is September's selection.