The WNC-0300 is an 802.11g/b PCI card, and is the counterpart of the WPC-0300 PC card. They share much of the software and documentary content, and it's pleasing to see the manuals and interfaces clean and well organised. Also, like the WPC-0300, this supports profiling, WEP and WPA security.
One thing to note is that the antenna is attached to the card itself and, unlike the D-Link AG520, cannot be moved or extended for better reception.
At $136, it's the most expensive card we looked at, but the increase in cost is not high. It's technically similar to the other cards, and its value really comes from the no-hassle bundle.