Based on the Marvel Previews #92, April for June 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 #663
Amazing Spider-Man #664
Fear Itself: Spider-Man #2
Spider-Man, Marvel Adventures #15
Ultimate Spider-Man #159
Ultimate Spider-Man #159, Frank Cho variant
Ultimate Spider-Man #160
Ultimate Spider-Man #160, blank variant
Ultimate Spider-Man #160, Mark Bagley "Spoiler" variant
Ultimate Spider-Man #160, Mike Kaluta variant
Guest Apps
Avengers #14
Avengers: The Children's Crusade #6
Carnage #5
Fear Itself #3
Fear Itself #3, Giuseppe Camuncoli variant
Fear Itself #3, Steve McNiven variant
Fear Itself #3, Stuart Immonen variant
FF #5
FF #5, I Am Captain America variant
Heroes For Hire #8
Hulk-Sized Mini-Hulks #1
Incredible Hulks Annual #1
Marvel Universe Vs. Wolverine #1
New Avengers #13
Spider-Girl #8
Spin-Offs
Venom #4
Venom #4, I Am Captain America variant
Reprints
Amazing Spider-Man / Ghoster Rider: Motorstorm #1
Amazing Spider-Man: Big Time #1
Avengers: Infinity Quest #1
Captain Britain Vol. 2: Siege Of Camelot HC
Essential Spider-Man Vol. 10 TPB
Evolutionary War Omnibus HC, Buscema cover
Evolutionary War Omnibus HC, Garbet cover
Fantastic Four: The Last Stand #1
Marvel Adventures Avengers: Captain America Digest TPB
Marvel Universe Vs. The Punisher TPB
New Avengers: Nannies And Nazis #1
Spider-Man: The Original Clone Saga TPB
Spider-Man: With Great Power Comes Great Responsibility #3
Ultimate Comics Spider-Man: Death Of Spider-Man Prelude Premiere HC, Komarck cover
Ultimate Comics Spider-Man: Death Of Spider-Man Prelude Premiere HC, McGuinness cover
Ultimate Six Premiere HC
X-Men: Great Power #1
X-Men: Great Power Premiere HC