Based on the Marvel Previews #84, August for October 2010, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Man #645
Amazing Spider-Man #645, Spidey Vs. variant cover by TBD
Amazing Spider-Man #646
Amazing Spider-Man #646, Spidey Vs. variant cover by Chris Bachalo
Amazing Spider-Man #646, vampire variant cover by Mike Mayhew
Amazing Spider-Man #647
Amazing Spider-Man #647, variant cover by Steve McNiven
Shadowland: Spider-Man #1
Spider-Man / Fantastic Four #4
Spider-Man Vs. Vampires #1
Spider-Man, Marvel Adventures #7
Ultimate Spider-Man #15
Guest Apps
Avengers #6
Avengers & The Infinity Gauntlet #3
Carnage #1
Carnage #1, variant cover Arthur Adams
Carnage #1, variant cover Clayton Crain
Daredevil #511
Daredevil #511, vampire variant by Jock
I Am An Avenger #2
Marvel Holiday Magazine
New Avengers #5
New Avengers #5, vampire variant by Stefanie Perger
New Avengers #5, variant cover by Stuart Immonen
Strange Tales Vol. II #1
Ultimate Mystery #4
Reprints
Atlantis Attacks Omnibus HC, Layton cover
Atlantis Attacks Omnibus HC, Mayhew cover
Essantial Ghost Rider Vol. 4 TPB
Hulk: Wolrd War Hulks - Hulked-Out Heroes TPB
Marvel Masterworks: The Amazing Spider-Man Vol. 5 TPB
Marvel Masterworks: The Amazing Spider-Man Vol. 5 TPB, variant edition
Spectacular Spider-Girl: The Last Stand TPB
Spider-Man: Grim Hunt Premiere HC
Spider-Man: Peter Parker TPB
Spider-Man: The Gauntlet Vol. 3 - Vulture & Morbius TPB
X-Force: A Force To Be Reckoned With Premiere HC
X-Force: A Force To Be Reckoned With Premiere HC, variant edition