Datawhale.com

At www.linksysinfo.org there is an excellent article about how to fix your bricked WRT54G router. There are several different methods that they discuss. I tried it on several routers and it worked. Good luck.

There is a very good chart on www.linksysinfo.org that shows the differences in various firmware hacks for the WRT54G series routers.
The chart compares Sveasofts Alchemy, DD-WRT and Sveasofts Talisman. There are several versions of the routers that have been created and this which ones are compatible with which firmwares.