So, last weeks Apple event introduced Airplay. More specifically the licensing of AirPlay to 3rd parties, so suppliers of active speakers, AV receivers, TVs etc. can use the system without having an Airport Express as client. Sources can be iTunes plus any iOS4 device such as iPad and iPod. So that would mean you can keep music on the iPad, then have that content streamed to, say, your AV Receiver. Or have music streamed from iTunes to your iPhone, it appears to be an any-to-any protocol. Still no clue on multi-zone etc. Squeezebox and Sonos could put the AirPlay support in their Server/players respectively and market them as part of the Apple iTunes ecosystem. Squeezebox at least have shown they want to integrate by having Squeezebox Server index a local iTunes database. With Airplay, they could do this far more elegantly.