Wi-Fi Network Monitoring Tools?

Brian the Wise asks: "For all of you with large and/or complex wireless networks out there, what tools (commercial or otherwise) do you use to keep an eye on the health and state of your network? I'm not only interested in the security/IDS side of things, but also bad packets, reflections, clients flip-flopping between APs, etc. I've looked at all the usual open source projects, and so far Kismet comes the closest to my needs, but the wireless drivers on Linux do too much sanitizing of packets so I never see the bad ones. I know the FreeBSD drivers show more, but some of the advanced stuff (ie extra info from the Cisco Aironet drivers) is not supported by tcpdump or ethereal. Is there anything I can do besides getting up close and personal with the Linux network stack and drivers?"