Ive just got a second hand wifi card for my c760 and has worked just out of the box. In fact, I'm now writing this from the Z. It's a Sony Air Shot card. It was part of a Sony wifi projector. The projector broke and its owner has sold the wifi card to me. The card model appears on the sticker on the card as "IFU-WLC1". It's a 11mbps card and worked without trouble. I've been using it for almost an hour and the battery level has just dropped by 15%, so I guess it's not a very power consuming card. Since I got it for under $30, I guess it's not a bad deal.
BTW, the Z detects the card as "OrigoV2/Senao WLAN CF Card"
EDIT: I've just found the card is a rebranded model. The exact model is an Ovislink Airlive WL1100CF. It uses a prism 3.0 chipset