I have a Buffalo WHR-G125 (couldn't find any old Linksys routers anywhere) and have been running Tomato on it since day one. The web interface is beautifully done with loads of AJAX and pretty graphs. So far I have had no issues or hiccups with either the wired or the wireless interface and configuration is a breeze with the ability to download and backup your configuration files if, heaven forbid, you ever need to reset the router. For more information check out the lifehacker article -
Another great article and I would recommend it any day but if you are in the mood for a more fuzzier and feel good read with some good-living advice thrown in then grab a copy of "The Science of Getting Rich" by Wallace D. Wattles, available freely as a pdf on the internet.
http://lifehacker.com/344765/turn-your-60-router-into-a-user...