Interesting article. WRT wireless networking, there's software from MITRE called 'Mobile Mesh' that does mobile ad-hoc networking. It's at http://www.mitre.org/tech_transfer/mobilemesh/ (unreachable 2002/07/29 21:10 GMT, google cache works though)
This was adapted to 802.11b and is called "WikiWikiWan", http://wiki.haven.sh/index.php/WikiWikiWan. (CodeCon presentation MP3s available via BitTorrent at http://bitconjurer.org/BitTorrent/download.html)
Anyway, the reason I'm posting is I read the article, saw the snippet on the SAP/Jabber thing, and thought ''that's cool''. So now I'm 3-4 days of coding away from an IM interface servlet that talks to our software via the XML-SOAP interface. Not something you can sell, granted, but maybe cool enough to make a sale.
Thanks for the inspiration!