Paul,
There is a company called Connect 1 which makes a serial-WiFi device. It does take 200mA at 3V. The link is:
http://www.connectone.com/products.asp?did=73&pid=98
I'm going to give them a call on Monday.
The link below makes a device for connecting to your car's computer wirelessly via an iphone. pretty cool. It certainly can be done.
http://www.plxkiwi.com/kiwiwifi/hardware.html
Eric
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