LifeHacker has a special article up where they give simple instructions on changing the settings of a Linksys WRT54GL Wireless router so that it performs much better than the stock configuration.

After a relatively simple firmware upgrade, you can boost your wireless signal, prioritize what programs get your precious bandwidth, and do lots of other simple or potentially much more complicated things to improve your computing experience.

They break it down, and it looks relatively easy. Now if only I had that router…