Wireless networking to share your BB connection is a very sensible way to allow your laptop internet access and it is (in theory) relatively simple. Just install the wireless adapters, turn on Internet Connection Sharing on your desktop and run the Network Wizard on both PCs.
However, there may be some manual adjustments required and these are explained well by a click here
As for kit, click here for some good equipment. Just use a USB adapter on the desktop and a pcmcia adapter in your laptop.
Any problem just post back here.