Guess what I was able to save?
(The second picture is Ahmad Bradshaw on his way to scoring the weirdest winning touchdown in Super Bowl history.)
I tried Lexar Image Rescue earlier in the week, without success. Today, I bought a new card reader (being suspicious of the cheap one I'd been using--this one's at least a name brand, Belkin). I went to the Prosoft site, figuring I'd give Data Rescue 3 a try, but noticed that they had a dedicated photo recovery program, called Klix. I bought that, launched it, and noticed that, except for a single graphic, it looked identical to the Lexar interface. I wouldn't be surprised if it's the same program. In any event, I gave it a shot, and sure enough, the pictures all showed up as salvageable.
Thanks to all for assistance and encouragement.