If you want to have a go at this yourself at the next conference then it goes something like this:
Download XML/SWFChart.
Download my scripts.
You’ll need to install some perl modules – Net::Pcap,NetPacket::Ethernet, Net::MAC::Vendor and SWF::Chart.
1. Run a kismet scan for 5 minutes in the conference hall
2. Grab 802ether and run the kismet dump through it (this converts the 802.11 frames to ethernet frames so they can be analysed by libpcap libraries.
3. Modify get_macs.pl to skip the access point MAC address (by changing SKIP_MAC). Run get_macs.pl : ./get_macs.pl
4. Run process_macs.pl : ./process_macs.pl
5. Add chart.html (from my script tar.gz) somewhere on your web server and install the XML/SWFChart software, then point the XML/SWFChart software at the xml file generated by process_macs.pl.
6. Relax