I4U NEWS reviews the Belkin N1 802.11n Wireless USB Network Adapter.
A quote from the article:
>> Belkin N1 802.11n Wireless USB Network Adapter Review
This is a USB powered 802.11n adapter that connects without requiring any opening of your PC case. Installing the Belkin N1 Wireless USB Network Adapter is the easiest network card install I have ever done. To set the adapter up you simply plug it into the USB port and then install the software and you are done.
>> Belkin N1 802.11n Wireless USB Network Adapter Review