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.