Based on the Marvel Previews #60, August for October 2008, I'd say you need to pre- order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Girl #25
Amazing Spider-Girl #25, zombie variant
Amazing Spider-Man #574
Amazing Spider-Man #575
Amazing Spider-Man #573, Maguire cover
Amazing Spider-Man #573, Romita cover
Amazing Spider-Man #573, zombie variant
Amazing Spider-Man Annual #1
Amazing Spider-Man Family #2
Marvel Adventures Avengers #29
Marvel Adventures Spider-Man #44
Marvel Adventures Super Heroes #4
Secret Invasion: The Amazing Spider-Man #3
Spider-Man Loves Mary Jane #3
Ultimate Spider-Man #127
Ultimate Spider-Man Annual #3
Guest Apps
The Age Of The Sentry #2
Avengers / Invaders #5
Avengers / Invaders #5, sketch cover by Alex Ross
Avengers / Invaders #5, variant cover by Mike Deodato
Fantastic Four #562
March On Ultimatum Saga #
Marvel 1985 #6
Marvel Apes #3
Marvel Apes #3, variant cover by Stephanie Buscema
Marvel Apes #4
Marvel Apes #4, variant cover by Art Adams
Marvel Spotlight: Ultimatum
Marvel Zombies 3 #1
New Avengers #46
Secret Invasion #7
Secret Invasion #7, variant cover by Francis Yu
Secret Invasion #7, variant sketch cover by Francis Yu
Reprints
Civil War HC
Civil War HC, Direct Market edition
Essential Marvel Horror Vol. 2, reprint MTU 24
Hulk Chronicles: WWH #4, reprint HULK 109
Marvel Adventures Avengers Vol. 7: Weirder And Wilder Digest, reprint MA
Avengers 24-27
Marvel Adventures Two-In-One #15, reprint MA SPM #42
Marvel Masterworks: The X-Men Vol. 7, reprint ASM 92 & MTU 4
Marvel Masterworks: The X-Men Vol. 7, variant edition, reprint ASM 92 & MTU
4
Marvel Two-In-One #16, reprint MA Avengers #16
Marvel Zombies TPB, Hulk cover
Marvel Zombies TPB, Iron Man cover
Marvel Zombies TPB, Spider-Man cover
Secret Wars Omnibus HC
Secret Wars Omnibus HC, Direct Market edition
Spider-Man Magazine #3
Spider-Man: A New Goblin TPB, reprint ASM 176-180
Spider-Man: Brand New Day #1, reprint ASM 546-547
Spider-Man: Brand New Day Vol. 1 TPB, reprint ASM 546-551
Spider-Man: With Great Power... Premiere HC
Spin-Offs
Venom: Dark Origin #3