Surprised there wasn't already a thread for this already (or at least I couldn't find one). Anyways, "Complete list of titles" from Amazon
Alex Kidd in the Enchanted Castle
Alien Soldier
Alien Storm
Altered Beast
Beyond Oasis
Bio-Hazard Battle
Bonanza Bros.
Columns
Columns III: Revenge of Columns
Comix Zone
Crack Down
Decap Attack
Dr. Robotnik's Mean Bean Machine
Dynamite Headdy
ESWAT: City Under Siege
Fatal Labyrinth
Flicky
Gain Ground
Galaxy Force II
Golden Axe
Golden Axe II
Golden Axe III
Gunstar Heroes
Kid Chameleon
Landstalker
Light Crusader
Phantasy Star II
Phantasy Star III: Generations of Doom
Phantasy Star IV: The End of the Millennium
Ristar
Shadow Dancer: The Secret of Shinobi
Shining Force
Shining Force II
Shining in the Darkness
Shinobi III: Return of the Ninja Master
Sonic 3D Blast
Sonic Spinball
Sonic the Hedgehog
Sonic the Hedgehog 2
Space Harrier II
Streets of Rage
Streets of Rage 2
Streets of Rage 3
Super Thunder Blade
Sword of Vermilion
The Revenge of Shinobi
ToeJam & Earl in Panic on Funkotron
ToeJam & Earl
Vectorman
Vectorman 2
Virtua Fighter 2
Wonder Boy III: Monster Lair
Wonder Boy in Monster World
I'm happy with them adding Space Harrier 2, Sword of Vermilion, Alien Soldier, and Gunstar Heroes, but I have to say I'm triggered beyond belief that they didn't add the english version of Monster World IV that they released on last gen consoles. If they don't bring back the unlockable arcade games then I'm probably not going to buy it, and in particular I'm really hoping they add the arcade version of Thunder Blade.
... I guess what I'm really getting at here is Sega REALLY needs to release an arcade collection already.