Of course I am a little late, but litterally the ULTIMATE guide to wrt54g hacking is shipping:
http://www.amazon.com/Linksys-WRT54G-Ultimate-Hacking-Asadoorian/dp/1597491667

Also, you can check out Paul Asadoorian and Larry Pesce at http://www.pauldotcom.com

You can also download the PDF version of the book at: http://www.syngress.com/catalog/?pid=4170

CONGRATS GUYS… now where is my free copy?

mubix