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®ion=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)
