Since auxiliary docks aren't yet available, I'd be tempted to try one of the PDA/Cell phone mounts and simply use a 1/8" Phono to RCA patch cord. I've not personally tested battery life yet, but I'm told it's about 10 hours, which'd cover most trips away from the charger. The AC charger will also plug directly into the Karma (skipping the base), so it'd be possible to hard wire some power. The interface is intuitive enough to do without looking at the player for most functions.

-Zeke