As far as I know you are pretty much going to need a PCI->PCMCIA bridge, then you'll buy a PCMCIA 802.11 card (assuming you mean 802.11b when you say wireless).
The ISA->PCMCIA adapters usually get better reviews, though that may be because of linux driver support (haven't looked at windows solutions).
As far as which pcmcia 802.11 card to get, easy to find good reviews. I'm happy with my Orinoco, the Linksys is supposed to be a good card as well.