Konami - Metal Gear Solid, has for the most part, always been a PlayStation exclusive. I know they put the offshoots on other systems, but the MAIN MGS games have always been Sony PS exclusive. Tecmo - Ninja Gaiden (for a long time was exclusive), and now Quantum Theory will be exclusive Square Enix - Up until this generation, their games were mainly exclusives. SEGA - I guess theyre staying old school by remaining exclusive. Sonic, Mad World, Yakuza, Conduit, House of the Dead, etc... They seem to prefer staying exclusive with most of their games. I wonder if they do this by choice, or if they're even being paid to stay exclusive with some games? I don't see why Mad World and Conduit aren't going to be on any other systems. Namco Bandai - Again, much like Square Enix, were always exclusive up until this gen. Ridge Racer, Star Ocean, Katamari, and a couple others are still exclusive...but their big games (Tekken and Soul Calibre) are now multiplat.
"I don't have time to play video games anymore, but if I did, I would definitely choose the PlayStation 3 instead of the 360" - President Barack Obama