Yup, thanks, I've had the best luck with the Chinese vendors on Ebay as well, So far the only 4GB sticks that work are the MS-EX4G marked H624L3L. I bought a 3 pack at a special price from the Tall's Camera website which were marked differently and none of them worked in my D1 but I tested them in my PSP 3000 and they worked fine. As far as I can tell it only gets picky with the 4GB cards. I haven't tried any Sandisk cards, what model number do I need for a 4 GB card?
Thanks,
Jon