Hi,
I think these devices are getting more common.
Recently I bought a wirless access router for my house and it included not only a parallel port for the printer but also a USB port you could stick a webcam into, so its probably a matter of time before we see wireless node devices designed to plug webcams into, and relativly cheaply since a market seems to home security.
uk.asus.com/products/communication/wireless/plug-webcam.htm
Somewhat related, those with Intel Centrino laptops may be interested to know that there is now support for the wireless component of the chip in Linux, thanks to Intel finally being cooperative. So no need to run windows on your laptop or buy a separate wifi card!
ipw2100.sourceforge.net/
Cheers,
~Al
  