I never thought I'd be sitting around singing the praises of the iPhone on this list. The hardware was just too limited no buttons, no sticks, no tactile feedback. But hordes of developers have proved me totally wrong: this thing can game. Exhibit A out of dozens of quality iPhone games this year: Geo-Defense Swarm, a rich, fast-paced, visually stunning take on the tower-defense genre. Tricked out with neon-glowing candy colors that show off the iPhone's ridiculously overpowered display, Swarm is a little masterpiece of interface design, balanced game play and clever level design.