Based on the Marvel Previews #98, October for December 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 #675
Amazing Spider-Man #676
Avenging Spider-Man #2
Avenging Spider-Man #2, variant cover
Spider-Man, Marvel Adventures #21
Ultimate Spider-Man #5
Guest Apps
Avengers: X-Sanction #1, blank cover
Avengers: X-Sanction #1, regular cover Ed McGuinness
Avengers: X-Sanction #1, sketch cover Joe Quesada
Avengers: X-Sanction #1, variant cover Ed McGuinness
Avengers: X-Sanction #1, variant cover Joe Quesada
Avengers: X-Sanction #1, variant cover Leinil Yu
Carnage, U.S.A. #1
Carnage, U.S.A. #1, variant cover Humberto Ramos
Marvel Holiday Special 2011
New Avengers #19
Spin-Offs
Venom #10
Venom #11
Reprints
Incredible Hulks: World War Hulks HC
Secret Wars TPB (new printing)
Secret Wars II TPB
Spider-Man By Mark Millar Ultimate Collection TPB
Spider-Man Through The Decades TPB
Spider-Man: Chapter One TPB
Spider-Man: The PSAS TPB
Ultimate Spider-Man Must Have #1
Ultimate Spider-Man Vol. 3: Death Of Spider-Man TPB, Kormack cover
Ultimate Spider-Man Vol. 3: Death Of Spider-Man TPB, McGuinness cover
Untold Tales Of Spider-Man Omnibus HC
Untold Tales Of Spider-Man Omnibus HC, direct market variant