Thanks for this.
I don't believe putting the SD card in the optical drive is a "stupid mistake" . . . though I felt stupid, the moment I did it . . .
The two slots are very close in proximity and, if one is accustomed to simply reaching over to slide in a CD, it's a mistake bound to happen.
Hence, it occurred to me others surely had done this, and there must be a thread with solutions.
The paper clip method didn't seem advisable, given the pressure of metal within the optical drive.
We tried a folded business card, and that worked, without cutting into an L shape, or shaking the machine. My SD card was not pushed in far, because I panicked, the moment I realized what I'd done.
Thank you all very much for the suggestions.
Now that we're in 2011, perhaps Apple will recognize this as an ongoing problem, and see the design flaw. No reason the two slots couldn't be on opposite sides of the monitor . . .