Linksys WUSB11 (v2.6) and SMC 2602W (PCI, v3)
Linksys WUSB11 USB is great for wardriving, but does not show the channel an AP is on. I plan to replace it with an Orinoco Gold card.
The SMC 2602W setup is not meant for wardriving (as it's a stationary machine in my living room), but it works in NetStumbler nonetheless. It does not use a prism based chipset (it uses NDIS 5.1) and the AP seems to disappear every other scan. But, like I said, this is not a wardriving machine (although I could set it up in my car because it's a Shuttle PC -- a nice 200+ watt inverter should do the trick

).