Bigbruin.com has posted a review on the Vantec NBA-100U 5.1 Channel USB Audio Adapter
A quote from the article:
Vantec NBA-100U 5.1 Channel USB Audio Adapter Review
The key selling point of the Vantec NBA-100U is that you can add 5.1 channel stereo surround sound to just about any computer with a USB connection. While it might not be a good solution for a desktop computer, especially since most have integrated 5.1 channel audio these days, it is a great investment for any laptop user looking for an audio upgrade.
Vantec NBA-100U 5.1 Channel USB Audio Adapter Review