Got the 60$ Linksys blues? Try http://openwrt.org/; their totally free Linux based router software can be flashed onto yours readily, and expose a whole host of normally very expensive options. It’s nifty, it’s fast, and it’s surprisingly well supported/documented.

It’ll let you administer your router per-port, build your own widgets, and generally do the unexpected with your router.

Or, if you really don’t like your warrenty, you can try http://rwhitby.sourceforge.net/wrt54gs/serial.html, and add serial ports to same.

 As always, happy hacking!

-N. Noctis