Who's "they"?  It's the same game that came out a year ago for 360, but with new playable characters.

Ninja Gaiden Sigma 2 features a whole lot more than that. Not only does it feature 3 brand new playable characters who will all be playable online along with Ryu in the brand new online co-op mode, the game also features new weapons, new enemies and large-scale bosses, new branching storylines, as well as a completely overhauled graphics and physics engine and a new camera system as well as subtle but constant detail changes such as less emphasis on blood and gore and more on flashy combos, movements, and techniques. Hell, it's even being done by a different director and team. It's in every sense a remake just as the original Sigma was and it's exclusive.

I also opt for it to be included.

According to this, Trine is coming to XBLA :

http://www.joystiq.com/2009/06/04/atlus-publishing-trine-on-xbla/

PSN exclusives:
Smash Cars: http://playstation.joystiq.com/2009/06/09/smash-cars-to-flip-onto-psn-this-month-demo-planned/

Mushroom Wars: http://playstation.joystiq.com/2009/06/09/mushroom-wars-brings-more-cute-cuddly-rts-death-to-psn/

Battle Tanks: (?) http://www.joystiq.com/2009/06/07/hands-on-battle-tanks/

Under Siege is exclusive. Add that!

Did you get Trinity Universe, Last Rebellion, and Zill O'll?

Summon Night 5 is also rumored.

I agree that Ninja Gaiden Sigma 2 should be included on the list. NGS2, with its bonus content, cannot be played on 360.

@ultibankai: It's been on the list for months...

@outlaw: I added Tinity: Zill O'll days ago, and I'll be adding the rest soon.

As for NGS2, it just feels like a late port with extra crap tossed in to me. I'll look into it and decide later.

CHANGE THE LAST GUARDIAN PICTURE or I swear, I'll figure out how to hack the site and change it myself.

You are SO lazy, MM -.-

http://ps3media.ign.com/ps3/image/article/993/993432/the-last-guardian-20090610095335988.jpg