In reply to:

Gapless playback is now a nonissue for the car player, as it can now (in version 2.0) play two tracks back to back with no gap whatsoever.

Any remaining issues with gaps are entirely the result of MP3 encoders and their inherent inability to create truly gapless files due to limitation in the MP3 format. This is all in the FAQ.

Not quite - I still have a wish for the player to use the tag that Lame adds to discard the right number of samples from the beginning and end of tracks, giving gapless playback with no extra work at encode time.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)