I so want an "always in my pocket" smartphone gaming solution. Ideally a modern Xperia Play style slider phone with buttons and a slide pad but I'd also take a keychain-sized Bluetooth gamepad that attaches to the phone. Something visually like an iMpulse controller that plugged into the USB port and gave you an upright Gameboy-style experience. Every pocketable gamepad on the market expects you to have a table to rest your phone on.

Yes! I still have one, and it is amazing.