A discussion on a MIDI hackers' forum about wireless MIDI gave me some ideas for wireless serial-port solutions. Perhaps this could be a cheaper, simpler, smaller alternative to WiFi, or even ethernet, for all those Duo hackers out there?
And for those trying to hack up cordless phones as wireless modems.
MIDIbox discussion: http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=misc;action=display;num=1066118673
Wireless serial chips (link corrected to the current model): http://www.linxtechnologies.com/ldocs/modules/m_hp3.shtml
Another version: http://www.linxtechnologies.com/ldocs/modules/m_es.shtml
"Transparent Serial Data Output (56Kbps max.)
Direct Serial Interface
Up to 1000ft"
You'd need 4 chips for a bidirectional serial link - two TX and two RX. And who knows about getting small quantities...