Well, I think the included USB extension cable.
(Although I'm at the actual product description is not sure if it still beiligt.)
I still belong to the group with a desktop PC, I've also needed.
On a notebook on the go, there is virtually no extra time, because of the USB "stub" can be mounted behind the unit.
So far I have used it with CF, SD, Memory Stick Duo and Memory Stick Micro (M2) without problems.
With the sliding function I have no problems so far. The card slots are with me always front and stay there when I plug in the card, without which I must hold him.