If you know anyone who uses an Apple Magic Trackpad, you know that they tend to love it. There hasn't really been a good, similar, option for the Windows users. Logitech aims to change that with their 5-inch gesture friendly Wireless Touchpad. The Logitech wireless touchpad connects to the PC via a 2.4GHz USB dongle.
The large 5-inch surface will allow for some pretty intense gestures, you shouldn't have any problems getting four fingers in on the action. All this on a windows box, nice.
Expect to see the Logitech Wireless Touchpad for $49.99 later this month.