I just found out a new version of the wireless USB adapter is available from Cables Unlimited, which would explain why availability of the old one had been drying up. The updated information came from a readers blog that built one using the newer trulink device, thanks Justin.
The build should be the same, the packaging of this unit is more elegant then the previous, and it has external antennas which could be useful. It will however still require an external power pack. Also the price seems to be a bit higher.