I noticed this helpful information at MacInTouch and thought it would be of value here, too. Macintouch published a quote from Robert Poore, who found a trick for supporting a Lexar reader in Mac OS X. Robert noticed that the the Lexar USB dual media reader, which lacks OS X drivers, was identified (in Apple System Profiler) as a Carry Computer Co. device. Over on Apple's OS X driver download page, there are drivers for Carry Computer devices. Roert downloaded and installed those drivers and found that the Lexar USB dual media reader was now fully supported in OS X.
I haven't installed/tested the driver myself yet because the VISA installer wants to close all other apps first (how Windows-like of it) so I'll do it (and possibly reboot) when I'm ready, but it sounds like it should work.
[Editor's note: If anyone has tested this yet, please post your results.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020417093537849