http://www.zensonic.com.au/press_z500.php
Windows, Mac OS X and Linux compatible. 802.11b/g, gigabit ethernet, USB 2.0 - Windows format iPod compatible. Plays DVDs, CDs, MPEG-4, DivX, XviD, WMV, WMA, MP3, OGG, ACC (aka .mp4). Etc. HDTV compatible, surround sound out. AUD429.
I'm thinking if Apple ever builds a media centre box (or AirPort Express Video, or whatever), it will be similar to this - wireless and wired, port for your iPod, plays a range of formats, HDTV compatible. I doubt Apple would include the DVD drive, but that's about it.