Wireless ie 802.11b, 802.11a and 802.11g as well as some old AT&T stuff

this area has exploded in the last few years with the drop in price of 802.11b cards

I use an Avaya card in most of my stuff and Cisco and D-Link access points

Netstumbler for Windoze and Kismet for Linux are the standard for finding networks and range testing your setup

A good artical on the D-Link AP900+ is located here

A great HOWTO on getting Kismet working on Red Hat 8&9 is located here