Since I planed to go to OS X I used the Apple Kit for MacPro (after 01/08). Thats an Broadcom Card with 802.11 a/b/g/n and it fits perfectly under mac osx. For the windows part you can use the bootcamp drivers included on the leopard dvd. And by the way: Because this is an kit for getting an mac pro to wifi after already bought it, this card is only availabe to apple service... but here in germany i found an dealer who sold this to me, he didnt care about that and the card only costs 37 euro, thats about 49$. But remember to get the card for mac pro after 01/08, there is another card available for the older mac pro, this one will not work, even it looks the same, but i think it is not a mini card, it seems to be a pci express...