Somehow last week we missed the Sony Vaio WA1 Wireless Digital Music Streamer. It's a simple (and not necessarily new) concept: the device taps into your pre-existing Wi-Fi connection and streams the music that's directed toward it. For example, you've got a PC loaded with music in your bedroom but you want to hear Sleater-Kinney and other riot grrl in your living room. Turn on the WA1 and the device taps into your computer's music. (Apple's Airport Express has done this for years, but you need to supply your own speaker there.) The WA1 is compatible with all the major music formats (MP3, WMA, AAC, etc.) and will cost some $350. That's a bit pricey especially since this doesn't really do anything other than stream music. Oh, Sony, why do you do this to yourself?
Update: Perhaps the original wording here wasn't as clear as it could have been. This streamer is an all-in-one solution. That is, the speaker is built-in so there's no need to hook the device up to a separate sound system like you do with the Airport Express. Still, that doesn't mean that Sony isn't promoting wireless music streaming as if it were some revolutionary technology when it clearly isn't. If you've got the cash, this probably isn't a bad place to start experimenting with wireless music. Just pray that Sony's notoriously bad software doesn't ruin the experience.
Press Release [Sony]