Previous to owning my laptop which has an SD card reader, I used this little device to transfer pictures onto my computer. It is a card reader/writer from Digital Concepts. It is very simple, but very effective! One end is a USB, which fits into any USB port on your computer, and the other end is a reader slot for an SD card.
To use it, you just need to plug it in to your computer, wait for the computer to recognize the device, and then insert your SD card into the slot. From there you can transfer your pictures or other information from the card onto your computer, transfer files from the computer onto the card, or simply access the card and edit the files that are on it. When you are finished, you just need to disconnect the same way you would any other USB device.
I prefered using this over the cable that came with the camera, because it was so slick and easy. This is also the perfect solution if your camera did not come with a transfer cable, or if you just want to use SD cards for their storage, and not as a camera card.
My husband got this for me, so I don't know where this particular one came from, but I have seen them at Radio Shack/The Source for $3-$4. A small price for such a handy device!