Winner: Julian Lee, congrats!
If you haven't read our review of the LG Optimus G, you should definitely check it out - this is one powerhouse of a phone. And, courtesy of AT&T, you can win one on this very page. You can also pre-order the Optimus G directly from AT&T, for $199.99 on a new 2-year agreement, at this link.
The AT&T Optimus G is packing a quad-core Snapdragon S4 Pro processor with 2GB of RAM, and I can tell you from first-hand experience that it is fast.