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 -
http://lifehacker.com/344765/turn-your-60-router-into-a-user...