iOS is Apple's mobile operating system developed originally for iPhone, and later deployed on iPod Touch and iPad.

Screenshots from the iPad version of upcoming indie adventure Sword & Sworcery EP.

Similar to the treatment Final Fantasy and Final Fantasy II received, the classic action-adventure Secret of Mana is in the midst or receiving an iPhone port. According to Joystiq, Secret of Mana for iPhone will be released sometime this year.
iPhone OS 4, coming this summer, will launch with "Game Center, Apple's new social gaming network". Players can "invite friends to play a game, start a multiplayer game through matchmaking, track their achievements, and compare their high scores on a leader board."

Sword & Sworcery EP is an adventure game for iOS that is both minimalist and cinematic. It's the collective brainchild of designer Craig "Superbrothers" Adams, indie studio Capy (Might and Magic: Clash of Heroes, Critter Crunch), and musician Jim Guthrie.
Adams is a leading patron of cinematic approaches to game design (see Less Talk More Rock). Indeed, EP has been described as being "about unspoken dialogue between itself and the player: responding to your own curiosity and whispering questions rather than shouting demands." Read on
thumbs upHarbor Master is an iPhone game wherein you manage the incoming and outgoing ships among several harbors. A simple premise, but one with lasting appeal; I've been playing several hours a day since I got my new iPhone a week ago. Full Review