Do any of the Rockbox supporterd HD players accept a CF with a suitable adaptor?
With the price of a 16Gb CF card approaching £100, I'm tempted to experiment if the player itself is cheap enough.
Obviously a Rockbox supported player with a CF slot would be better, but even non-Rockbox supported are few and far between.
The only (non-Rockbox) contender is a NexBlack, and this has quite a few limitations of its own.