I also bought a new digital camera... and apparently I signed up for a $24 lesson: "Differences Between Memory Card Formats 101". I bought a 4GB SD card, not realizing that the camera (Sony Cybershot DSC-H10) takes Memory Stick Duo cards, which are completely incompatible with SD cards, being a different size.
Anybody want a brand new 4GB SD card? No, screw that, I'll use this as an excuse to buy a second camera, and look for one that takes SD. :P Maybe. I dunno.