The Make Blog has a link to the nice step-by-step instructions on how to upgrade the value of your router by 10 times! I’ll have to try this when I get back from my sister’s place.
Some of the features available after the upgrade include boosting your wireless signal and throttling your bandwidth by program.
Update: I just hopped downstairs and found that the particular model of Linksys router that I have isn’t on the list of supported routers. Too bad, I would have liked to try this.