I've used a slimp3 in my house for awhile now. Simple MP3 network appliance: small screen and remote control streams MP3 from your server. Slim Devices has now released a wireless version, the Squeezebox.
The biggest change is built-in 802.11b; no more need for an wireless/ethernet bridge. They also put in a digital out and wrapped it in a more conventional case. Looks like nice improvements.