Personally, I still don't see the appeal of today's media consumption tablets. It's too big to carry around unlike a smartphone, yet too small to do any real productive work on it. The Asus Transformer tablet/laptop hybrid looks cool though. But even then, its mobile OS is a significant constraint.
Let's see how tablets evolve over the next few years. Things might get a little more interesting as Microsoft brings out its Windows 8 tablets next year.