There seems to be a lot of people saying they want a tablet...but I haven't seen a single post from anybody who owns one...
Tablet PCs have been around for years, and not many people use them. The reasons they are not popular are obvious - there are really no usage cases I can think of that a tablet covers that a laptop/netbook/PC/PDA/phone can't do equally well or better. A tablet is only slightly smaller/lighter than a laptop but with the same ratio of size
ower.
I find e-ink much better for reading. Touch screen computing is a terrible experience as soon as you need to type something. It's painful watching someone type on an iPhone. It's like watching someone struggling in slow motion. A tablet is too large to carry around casually (e.g. on the train), and if you're at home (or anywhere portability isn't an issue) surely a laptop or even a netbook would be more useful.
Why not just get one of those laptops with a swiveling lid that converts it to a tablet but also can be used as a laptop? Best of both worlds, and it wouldn't be much larger or heavier than a dedicated tablet.
That demo of Liquavista looks promising from a reading standpoint.
I think a future device might be able to include both screen types in two layers. E-ink for low power usage and reading text comfortably and in well-lit conditions, and an LCD (or OLED) for animations, colour illustrations, video, etc. That would be a multi-purpose device that I would leave a dedicated reader for.