Elecom's MR-C25 is a USB SD-card reader designed for laptops and notebooks-- with a twist.
The device doesn't stick out perpendicularly to the machine's side, but lays flat on the side. It also swivels as needed, getting out of the way if it covers up other ports next to it.
It is also thin enough to stay in one place even one slips the computer into its carry case.
The reader reads SDHC and SDXC formats, and has a separate slot for microSD cards.