Hi, I use Linksys WRT54G Routers and I suggest that you check out DD-WRT firmware. It includes Chillispot and is easy to setup. I've posted a tutorial here http://swarmhotspots.com/faq.html
BTW the new WRT54G (Release 5 Firmware) uses VxWorks and not Linux anyone needing to use third party firmware like DD-WRT should buy WRT54GL instead. I hope this helps. Regards, Sean Bracken - List info/subscribe/unsubscribe? See http://www.freeradius.org/list/users.html