I have had a good experience thus far with SDHC cards in the N800 as well.

I use an 8GB Patriot from a retailer in Canada

And from the same retailer a 16gb model.

I use the 16gb in the internal slot and the 8gb in the external.

I do find it much faster by far to transfer info from my Vista machine using this device instead of connecting the N800 directly with the usb transfer cable. Also gives me the option for 17gb extra storage in my pocket.

This is with the latest 2007 firmware - Internet Tablet OS 2007 edition (version number 4.2007.38-2).

/salute!