For wireless clients, you can't go wrong with Orinoco (Avaya, Proxim, Agere, Lucent, whatever their name is this week, etc.) products.

Currently my laptop is running a Dell TrueMobile 802.11b mini pci card (I think it's this one). It is based on/made by Orinoco, so Netstumbler works with it.

This week I bought the Dell TrueMobile 1300 mini pci card. This is 802.11g and only $49 - 10% so it's a good deal. It is not made by Orinoco. I have not received it yet.

For desktops that need wireless, I use the Orinoco USB Gold. I don't know if they sell it anymore, but I have plenty.

The card in the USB Gold is just the Orinoco Gold PCMCIA card. So, those work well too.

I have also used a D-Link 802.11a PCI card paired with a D-Link DWL-5000AP. Despite my dislike for D-Link wireless products, this seemed to work well once you got it configured properly. It was very fast.