ZLive Speaker Dock for Zune
"The ZLive NS108B speaker system makes sharing your music a snap. This system connects to all Zune players through the certified connection. You also can connect to any MP3 player, cell phone, or video game system through the line input. Control your music from across the room with the remote, and enjoy room-filling sound from the acoustically calibrated stereo speakers."
Here's another Zune speaker dock for your listening pleasure. It's got the requisite charging/play dock, large speaker wall, and remote for playing across the room, but it also features a clock and RCA video-out for using your Zune with a TV. The speaker dock is available at Amazon for $60 (Affiliate link), which seems a little steep to me, but Jason saw it last week for $35, so it's likely to come down in price again soon.