I know a bit late but I haven't found too many people using 16 GB cards in their n800's so I thought I'd post.

I currently have not one but two 16 GB cards in my n800 and I've had no stability problems whatsoever. I'm running OS2008 Version 2.2007.50-2.

One card is a 16 GB SDHC Patriot card and the other is an Adata 16 GB SDHC card. DiskUsage says I have 16 GB on the Patriot card and 15.7 on the A-Data.

Grant