Great thread.

This little baby from IguanaWorks makes all of my IR dreams come true. Combined with an OpenWRT router it's pure magic. I use one on an ASUS WL-500W and on a Linksys WRTSL54GS. Both of which are also great gadgets. I too hook up a USB sound card to my ASUS for both streaming and local playback via mpd. That ASUS can be had for $50 at newegg.

USB is my favorite technology to date, it allows even my most simplist gadgets to fornicate and reproduce beautiful music together.