In terms of mobile devices, this is still called "flash", the only reason it's referred to as a "hard drive" is because you can drop it in as a replacement in desktops PCs and they didn't want to confuse the issue for those users. There's no such thing as an SSD "Hard Disk Drive". Realistically, though, there simply isn't enough room (or battery power) to stick one of those in the NIT lineup.
I didn't either (and it's "770"), but the N800/N810's kickstands are invaluable and I wouldn't give them up for a semi-useful hardcover.