Anyone have experience using Audible.com's Audiobooks on their Mk2's? They are currently running a promo for a free Rio 600 (stocking stuffer) if you sign up for their monthly download service. They offer several formats, but their descriptions are not stupid-intuitive. Arrrghhhh!

For example they describe Format #4 as, "Format #4 happens to be a version of MP3, the well-known compression technology used for music." What version? Apparently they use some copy protection scheme...

Format #4 seems like the only format that smells, looks, and quacks like MP3, so it must be.... Will it work on Mk2?

--Andrew