You can see the list of all games in the original Sonic's Ultimate Genesis Collection here:

http://www.vgchartz.com/games/game.php?id=29683&region=All

If it does well and Sega/Sammy decides to do another one, I am curious what games (and unlockable games) people would like to see in it.  The criterion likely needs to be games that Sega themselves published under their name, or created. Please list what you would like to see.  Of course, I would want Sega to include play over the Internet play to, and maybe a high score board.

Here is a some I would like to see:

Genesis Games

Gunstar Heroes

Thunder Force II, Thunderforce III, Lightening Strike/Force (Thunderforce IV)

Herzog Zwei

Driving games: Super Hang On, Super Monaco GP, Super Monaco GP II, Various Outrun titles

Wrestle War

Crack Down

Shadowrun (Yes, there are licensing issues, but one can hope, can't they? )

Green Dog

The Ooze

Biohazard Battle

Chakan: The Forever Man

Cyborg Justice

Devilish

Dynomite Duke

Evander Holyfield "Real Deal Boxing" (or the sequel)

Master of Monsters (ok, this is NOT a Sega title, but one could hope... in vain )

Pengo

Revenge of Shinobi

Sword of Vermillion

Toe Jam and Earl, Toe Jam and Earl 2

Virtua Racing

A game that is like Gravitar, whose name I forget.  Involved lunar lander type gameplay, with your ship shooting.  It is also like Solar Jetman

Unlockables

Arcade versions of the Genesis driving games

Power Drift (arcade)

After Burner (arcade)

Thunder Blade (arcade)

Alex Kidd games (Master system version)

Shadowdancer (arcade)

Penguin Land (Master System)

Quartet (Master System and Arcade)

Zillion, Zillion II (Master System)

Miracle Warriors (Master System)

A Fatal Fury game or two.

The Mortal Kombat series (1/2/3).

Michael Jacksons Moonwalker!

I tried to avoid third-party in this question, due to th licensing issues.  Hey, if Sega ends up buying up Midway, then it is possible that could happen.  Not sure that Fatal Fury would fit.  That would be in an SNK Collection though.  Speaking of SNK, I would like to see a pre-NeoGeo collection from them.

Sega only games people.

@richardhutnik
I like soe games you listed...but would like to add

Xmen 2 (can't believe its not on this one)
Batman & Robin (great but difficult as hell shooter)
Eternal Champions (again why is this not on the current collection)
Landstalker (one of the 5 best genesis games ever)

I went on Wikipedia and got the list of MegaDrive games it listed, and was able to pull them in.  I went for what I liked, plus a need for completeness.  Also, tried to look realistic into what would be likely to be done, and avoided the licensed stuff.  If licensed stuff would be in, Aladdin would be a MUST.  Also included should be Moonwalker (well, in my opinion.  Michael Jackson may actually cost sales today).

Musha Aleste
Thunderstrike 3 (Best 2d shooter ever)
Moonwalker
Golden Axe 4 (it was arcade only)
Alladin (it was made by sega right?)


Third parties:
Robocop versus Terminator
Gunstar Heroes
Super castlevania
TMNT 1 - 2 - 3
Captain Tsubasa (Any episode)

 Aladin was disney/Sega i believe...it could work.

All the games I listed should be sega published games as well.

never owned a genesis, so i have no idea.

Glad you included Shadow Dancer.