Hi folks, I was just wondering if there are any types, speed, capacities, etc., of compact flash cards that don't work well with the bookpoart? I'm thinking of buying either a 4 GB or an 8 GB card, and while I can use either of these in my computer, if the larger capacities don't play well with Bookport, I can save my money. I was also wondering if there was a way for the bookport to tell you how much free space you have left on a card? Thanks. ~Ann