Microsoft announced today its thinnest keyboard dubbed 'Bluetooth Mobile Keyboard 6000', which if you didn't notice in the name is designed exclusively for Bluetooth enabled PC's. The keyboard itself is just a few millimeters thicker than an AAA battery, with Microsoft's Comfort Curve design for a more natural wrist posture when typing. The keyboard will be available in October of this year with an estimated retail price of $89.96 for both the keyboard and number pad, and $44.95 for the number pad itself. Both are backed by a worldwide three year limited hardware warranty from Microsoft.