Wow, check out this old scribble.
Saw this listed. Turns your Windows box into a WiFi hotspot - imagine your wired laptop being used as a WiFi hotspot temporarily.
http://virtualrouter.codeplex.com/
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A review of some OSS 802.11b wireless hotspot tools:
http://www.wi-fiplanet.com/tutorials/article.php/3357611
This page describes some hacked router bios's for off-the-shelf LinkSys Wireless things. Cool.
http://www.seattlewireless.net/index.cgi/LinksysWrt54g#head-c19b483036d836a4fcc9814a6e9b4241a1c34536
This is a morphix (bootable linux CD) that does wifi hotspot stuff. It saves the config settings to a floppy.
http://www.publicip.net/zonecd/requirements.php