Maybe we should start listing which SD card we are using, and if we had a problem with the March firmware.
PNY's Optima SD HC, 4 GB NO problem at all with battery or other items. I've kept up with the firmwares, and now have the March 2010. No issues at all, [except no TTS

] My key presses sometimes need a second firm push, but I do everything off the SD Card.
AJ
And I ALWAYS exit a book, and Turn the PP OFF before pulling the SD card out.