Dell has quietly introduced the Wireless USB options in some of its notebooks. "Some of these notebooks" means that you can get Wireless USB in Inspiron 1525, Inspiron 1720 and the entire XPS gaming notebook line.
Wireless USB can be connected to a wireless USB hub or various external drives, printers and some other peripherals which have wireless USB support. According to various posts this thing should be as fast as wired USB 2.0, but we shall wait and see. This option, which includes Belkin's four-port Wireless USB hub, raises the price of Dell's systems by $150 and doesn't affect the ship date.
You can find them on Dell's Web site here.