Sean Butterworth stopped by the Microsoft booth and gave me a look at the new Microsoft Arc Keyboard, the mate to the Arc Mouse. I'm a huge fan of the Arc Mouse (cnet review here) mainly because it's portable enough to keep in my bag or even in a front pocket. This new keyboard looks equally nice. It's small, thin, and portable enough that it will be a great addition to my slate tablets when on the go. The USB dongle is even smaller than the Arc Mouse dongle, so once you plug it in you probably won't need to unplug it as there is very little profile coming off the USB port.