If you already have the WRT54G, you might want to try an alternate firmware that allows you to turn the power up a bit. DD-WRT gives you a bunch of options that the Linksys firmware does not.
If you run ethernet to another wireless router, just plug the cable into one of the switch ports and set up the wireless side. You don't need to set up DHCP or anything on the second router because it will basically just be acting as a switch.
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