I have been looking for over a year now for a quality in-dash (double DIN) GPS/receiver with gapless playback. All of the ones I have tried so far not only don't play back compressed audio gapless - the Clarion ( I am NEVER doing business with them again after the customer service fiasco they put me through) wouldn't even play CDs without gaps!
If anyone here knows of ANYTHING that provides gapless playback through the head unit's own player, I would be very grateful. Thank you.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic