Based on the Marvel Previews #62, October for December 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 #27
Amazing Spider-Girl #27, villain variant cover
Amazing Spider-Man #579
Amazing Spider-Man #579, villain variant cover
Amazing Spider-Man #580
Amazing Spider-Man #581
Amazing Spider-Man #581, villain variant cover
Amazing Spider-Man Family #3
Marvel Adventures Avengers #31
Marvel Adventures Spider-Man #46
Spider-Man Loves Mary Jane #5
Spider-Man: Brand New Day Yearbook
Spider-Man: Noir #1
Ultimate Spider-Man #129
X-Men / Spider-Man #2
Guest Apps
Avengers / Invaders #7
Avengers / Invaders #7, variant cover by Pasqual Ferry
Marvels: Eye Of The Camera #1
Marvels: Eye Of The Camera #2
New Avengers #48
Ultimatum #3
What If? House Of M
What If? Newer Fantastic Four
What If? Secret Wars
What If? Spider-Man: Back In Black
Reprints
Amazing Spider-Girl Vol. 4: A Brand New May
Hulk Chronicles: WWH #6
Marvel Adventures Spider-Man Vol. 11: Animal Instinct Digest
Marvel Adventures Two-In-One #18
Marvel Apes #0
Marvel Two-In-One #18
Secret Wars II Omnibus HC
Secret Wars II Omnibus HC, direct market variant
Spider-Man Magazine #4
Spider-Man: Blue Premiere HC
Spider-Man: Blue Premiere HC, Black & White
Spider-Man: Brand New Day #3
Spider-Man: Brand New Day Vol. 2 TPB
What If? Classic Vol. 5 TPB
Spin-Offs
Venom: Dark Origin #5