Be careful if you want to move data between different types of cards on the fly though, as (at least) one of the slots is overloaded i.e. one of the slots takes two different types of card, so sharing between them would not be possible. This isn't really a problem though, since even if you end up in this situation it's easily solvable by copying the data to your HD and then swapping cards to write it onto the new card.
