The X-Tube AS301DTS is an interesting little device. A fake looking vacuum tube USB dongle that lets you enjoy DTS surround sound right on your laptop. It’s powered by a VIA VT1610 chipset and is compatible with Windows XP, Vista or Windows 7.
If you want to get the full DTS effects, you’ll want to use a pair of AH-516 headphones though. Otherwise why bother? The X-Tube AS301DTS will cost you around $44.