Based on the Marvel Previews #66, April for June 2009, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Man #596
Amazing Spider-Man #597
Amazing Spider-Man #598
Amazing Spider-Man Family #7
Marvel Adventures Avengers #37
Marvel Adventures Spider-Man #52
New Avengers #54
New Avengers #54, variant cover Chris Bachalo
Timestorm 2009/2099: Spider-Man
Guest Apps
Avengers / Invaders #12
Avengers / Invaders #12, variant cover Dale Eaglesham
Dark Reign: Mister Negative #1
Dark Reign: The Sinister Spider-Man #1
Official Index To The Marvel Universe #6
Reprints
Amazing Spider-Girl Vol. 5: Maybreak TPB
Fallen Son: The Death Of Captain America HC
Marvel Triple Action #3
Secret Invasion Chronicles #4
Spider-Man Loves Mary Jane: Sophomore Jinx TPB
Spider-Man: Election Day Premiere HC
Spider-Man: Election Day Premiere HC, variant edition, direct market only
Spider-Man: New Ways To Day Premiere TPB
Spider-Man: Sinister Six Premiere HC
Spider-Man: Sinister Six Premiere HC, variant edition
Venom: Dark Origin TPB
X-Men / Spider-Man HC