Team ICO did not do Dark Cloud, that's Level 5 but he develop games for DS also.

Sorry, I meant this gen

No that was Silicon Knights, Konami did publish it though

Kojima Productions made some DS games this gen.. like Lunar Knights

Sony makin exclusives games "Yeaaaahh .... Yeaaahhh.."

DGC's post best sums things up so far, though many of those third aprty develoeprs are not exclusive developers.

Here is the list of third party developers sans those who (currently or plan to in the future) develop for other platforms as well:

And yes, I did remove Quantic Dream, because while they may have no current plans to develop anything for a non-Sony platform (that we know of at this point in time), they retained ownership of the Heavy Rain IP when inking their publishing contract with Sony, something that rarely happens between Sony and third parties. It's rather apparent that they want to retain a good bit of independence from whatever publisher they may be working with at the time.

Which is to be expected, seeing as how they are just starting to work together.  In time, they will likely become the equvilent of what is sometimes defined as a "Second Party Developer".   And yes, that did happen, Q.D. kept the IP to Heavy Rain, but, supposively the contract will be very difficult to break from what I've been told, so don't expect it to go multiplatform....ever.

Yeah, that's right. Dark Cloud is not from Team ICO.