Digital Home Thoughts: Napkin PCs

"We saw several napkin idea concepts last year but this is the first to utilize e-ink and RF technology. The Napkin PC is designed for group collaborations. Each pen transmits your doodles to the base station which is a PC in disguise. That information gets processed and displayed on the napkin like e-ink paper. Cool idea but someone better make sure nobody decides to wipe their dirty lunch stains with one."

Honestly, it sounds great, but don't such concepts already exist? I know it is not quite as thin but doesn't a Tablet PC sound awfully similar? I was always under the impression that when e-paper is actually available, tablet PC's would be available in that form factor. And then there are those special digital pens which will capture all of the users written strokes on only slightly textured paper. Yes I admit that these concept drawings are amazing but what's so new here?