Fit more music on your iPod shuffle - The Unofficial Apple Weblog - apple.weblogsinc.com

If and when I get my shuffle I'm definently going to be doing this. It's not so much a hack as it is just adjusting a setting to store files on the shuffle in 128kbps AAC files rather than the 192kbps MP3's I keep them in on my Powerbook. Cool none the less!