Some of these arent comics in origin, some are anime or video games but i think they fit the general idea...
Hellfire Club.
Rival Schools.
The Marauders.
New Mutants.
MegaMan.
Darker than Black.
Weapon X (Even if the Wolverine movie covers it).
Nightstakers.
Naruto (preferably Shippuden).
Mr. Terrific.
The Hand (sans Elektra).
JLA or JLU (only if Brandon is Supes and Bale is Bats).
Civil War.
Red Son.
Dragon Ball (any time period).
Bleach.
Spawn (yes, again).
Akira.
X.
Bishop.
Cable.
I'll try to avoid the already planned ones.
Silver Surfer - God damn, this could make a good movie. But JMS won't get off his lazy ass and get some producers! I mean, you could do so many things with him! He could face Thanos, Mephisto, the Stranger, or a number of different baddies, or you could even do a backround story! I think that the big issue, however, is that SS wasn't earth bound in the movie. That kind of ruins some good stories Marvel could adapt.
Doctor Strange - They could do it in a very contemporary world and make one heck of an epic magic movie.
Incredible Hulk 2 - It hasn't been announced yet, so I figure that it should be on here. I really really really really want to see the Leader, and even more so an Abomination/Leader team-up!