Based on the Marvel Previews #93, May for July 2011, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Man #665
Amazing Spider-Man #666
Amazing Spider-Man #666, Humberto Ramos variant cover
Amazing Spider-Man #666, Special Comic Shop variant cover
Fear Itself: Spider-Man #3
Spider-Man, Marvel Adventures #16
Guest Apps
Avengers #15
Marvel Universe Vs. Wolverine #2
New Avengers #14
Spider-Island Spotlight
Ultimate Avengers Vs. New Ultimates #6
Ultimate Avengers Vs. New Ultimates #6, Bryan Hitch variant
Ultimate Fallout #1
Ultimate Fallout #1, Marko Djudjevic variant cover
Ultimate Fallout #2
Ultimate Fallout #2, Marko Djudjevic variant cover
Ultimate Fallout #3
Ultimate Fallout #3, Marko Djudjevic variant cover
Spin-Offs
Venom #5
Reprints
Astonishing Spider-Man & Wolverine Premiere HC
Essential Peter Parker, The Spectacular Spider-Man Vol. 5 TPB
Marvel Point One TPB
Marvel Super Stars Magazine #5
Spider-Man / Fantastic Four TPB
Spider-Man: Am I An Avenger TPB
Spider-Man: Big Time TPB
Spider-Man: Blue TPB
Spider-Man: Origin Of The Species TPB
Spider-Man: The Complete Ben Reilly Epic Book 1 TPB
Spider-Man: With Great Power Comes Great Responsibility #4
Super Hero Squad MMO Magazine #1
Venom: Flashpoint #1