|If you connect the wireless router to your LAN by via WAN port (internet port), you will have to open ports at the WRT54G routers firewall, to be able to connect the other network devices.|
If you are connecting the WRT54G LAN to LAN, you have to turn off the DHCP funktionality at the WRT54G to get ip addresses from you BEFSR41 automatically. Then all devices are in the same subnet and you should be able to first see all the other devices and secondly access the internet.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!