Call of Duty 4: Modern Warfare details at IGN.

"Activision was giving demonstrations of the DS iteration of Call of Duty 4 in its business center today, and we've got a few more details to report on how the first-person shooter plays on Nintendo's handheld. We already wrote a pretty glowing preview, and after some more time with the game we're happy to report it is still impressing us."

Full Source: IGN