I'm a habitual rereader in general. If I like a book I've read it a half dozen times. In this case I've read A Storm of Swords the least amount of times of the series because I always came away with the thought it is Martin's best installment by far.
I will say that more than other book or cycle of books it has without the question the most in-between the lines and throwaway but not throwaway sentences, red herrings and not red herrings of any book I've read. There's definitely more debate/conversation/mystery points in this series than anything I've ever read, probably by the dozens. I definitely get more out of this read than anything other than maybe Erikson's Malazan series, another long series.
I kind of go in cycles and get into kicks. One month read Saramago, one month McCarthy, one month Edward Whittemore , one month Ishiguro, Mishima Yukio, Kobo Abe, or Ben Okri, another month will be Gene Wolfe or Neal Stephenson, and so on.
It's probably just an extension of addictive personality.
same here (though not to quite jay's extent! that's hard core, man!).
although, my tastes have broadened in the last decade or so, and my re-reading has slackened some. there are simply just too many new awesome books out there, i NEED to consume them all. i fear missing out on the next phenom author or book.
authors and books i've re-read include stephen king's it, the stand, eyes of the dragon and talisman, dead koontz' lightning, twilight eyes and watchers, robert mccammon's swan song, wolf's hour, they thirst and stinger, weis and hickman's dragonlance chronicles and legends (planning to re-read their unique rose of the prophet series soon!), GRRM's game of thones, RA salvatore's forgotten realms halfling's gem series, raymond feist's riftwar saga... and a bunch more that i can't remember. ken follet (there's a good one.). bernard cornwell...
some authors really hold up surprisingly well on the re-read. for example, stephen king's books are like talking with your best friend, and very easy to fall into familiar conversational rhythms. what's more, the more mature/smarter i get, the more new stuff i pick up and appreciate that i missed from the previous pass.