[BenOfTomorrow]

Gravity's Rainbow: recognized, but not recalled, as science fiction. I don't necessarily object to the classification, but it might not come to mind if I were making a list.

Also, Pynchon's prose is very rich - I expect popular lists to be dominated by lighter fare.

[zorked]

I find it amazing that the geekiest of all books ever written gets put aside in the geek canon in favor or space robots shooting lasers...