I'm slightly surprised that there has been no discussion here about the Russian URAL ConceRt headunit. It seems pretty rare, more so than the Empeg. There is a lot of stuff crammed into a small unit. It seems to have a 2.5" HD, CD Player, Radio tuner, an internal amplifier, VFD, and some sort of developer community/forum in Russian. Oh, and it does Karaoke!

Video: http://www.youtube.com/watch?v=bQ7umG7cWe4
Info: http://www.google.co.uk/search?hl=en&q=ural%20concert
Pics: http://www.caraudio.com/forum/showthread.php?t=212264
Manual: http://www.cdd.ru/repository/UCManual_eng1.pdf