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.
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...