Using two Transcend 8GB SDHC Class 6 cards in N800, here...$68 at Amazon. To get WinXP/Gateway to read them, I use a Sandisk MicroMate USB adapter which eliminates the card reader's year 2000 driver problem. The PC sees an 8GB hard drive, works great.

At random times, OS2007 simply stops talking to BOTH cards for no apparent reason. It reports nothing when the cards disappear because it's booting up when it seems to happen. Rebooting will not recover them, but a hard restart by removing the battery, counting to 5, replacing the battery then rebooting and everything is fine, no files corrupted....until it happens again. ("Please unplug your cable modem and plug it back in.")

It doesn't happen if you leave the tablet running all the time. I think there's a boot ROM bug it bumps into, occasionally.

This computer's too SLOW to worry about the differences in card speed.....(c;

Transcends are warrantied forever. They replaced one in another unit that was 3 years old without a fuss.

ALL these big memory cards just EAT YOUR BATTERY! Look at the specs on them, some time!