Apple's Airport Express is about to become a must-have. Rogue Amoeba's Slipstream
Mac OS X application will let you use any Mac application with the
Airport, not just iTunes. Pick an application source, choose the
Airport you want to send to, and you've got instant audio streaming
over Wi-Fi. The application is coming in early 2005 for US$25, with an
initial price of $20. (Screenshot shown is preliminary.) The product
hasn't been announced to the press yet, but Rogue did send an
announcement yesterday to its user list.