LG Quantum Windows Phone 7 device now from AT&T

The Quantum, the LG's first Windows Phone 7 device, is available from AT&T for $199 with a 2-year contract.
It offers:

3.5" touchscreen display with an 800 x 480 resolution;
full slide-out QWERTY keyboard;
802.11b/g/n Wi-Fi;
and more...