Try DD-WRT or Tomato then (Google is your friend, or take a look at www.linksysinfo.org).
Both free and, unless something's broken with the hardware, should be an improvement over the default. If the hardware itself is knackered, my suggestion would be either a WRT54GL (which is basically identical to what you've got) or a WRT300N (more or less the same router but with draft-N in place of 802.11g). The WRT54GL will run pretty much any of the third-party firmware and AFAIK the WRT300N should run most.
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