Folded Toad Froth: Linksys WRT54G with bluetooth console access
http://foldedtoadfroth.blogspot.com/2010/03/linksys-wrt54g-with-bluetooth-console.html
My prefered solution for general router console access is via a Bluetooth connection. This Bluetooth connectivity is provided with a Bluetooth module such as the "BlueSMiRF" module sold by SparkFun (see note below). The Bluetooth connection is based on the SPP/RFCOMM profiles which this module supports. Access from Windows, Macs, and Linux systems quite easy. I use hyperterm on Windows-based systems and minicom on Linux-based systems.
uanr.com - SD/MMC card fits in floppy edge-connector
http://uanr.com/sdfloppy
"The following images show how to put one of these connectors on your WRT54G(v4)"
The Open Source WRT54G Story
http://www.wi-fiplanet.com/tutorials/article.php/3562391
The story of the Linksys Wireless-G Router (model WRT54G) and how you can turn a $60 router into a $600 router is a little bit CSI and a little bit Freaks & Geeks.
Mobile Wireless - How to Mobilize your WRT54G
http://www.filefarmer.com/flyashi/wrt54g/shortstory.html
"So for a few months i've been trying to put a PC on an RC car and drive it around through wifi."