Adam Pash at lifehacker:
Of all the great DIY projects at this year’s Maker Faire, the one project that really caught my eye involved converting a regular old $60 router into a powerful, highly configurable $600 router. The router has an interesting history, but all you really need to know is that the special sauce lies in embedding Linux in your router. I found this project especially attractive because: 1) It’s easy, and 2) it’s totally free.
So when I got the chance, I dove into converting my own router. 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. Today I’m going to walk you through upgrading your router’s firmware to the powerful open source DD-WRT firmware.
Check the list of routers that can be converted but there are some very popular Linksys models, as well as a number from Buffalo and others.