"As part of a hands-on evaluation of the Microtek Take-It S1 Digital Camera, I had occasion to use a 512-MB, SanDisk, Ultra II, SD card ($280) and a SanDisk, ImageMate, USB 2.0, Reader/Writer ($20). The 512-MB SD memory card does a very good job of greatly expanding the number and size of JPEG photo files and AVI video clips that you can shoot with most any SD compatible digital camera.
"SD card and other memory card readers can be particularly useful to Linux operating system users. All too many digital cameras and other such accessory devices are not compatible with the Linux OS. However, if you use removable card memory such as an SD card, you essentially can make just about all, modern digital cameras compatible with Linux. More about that and the SD card reader further on in this article..."