Oh, I prefer paper too... by far. but unfortunately there is not enough room in my house to have all the books I would like and sometimes it is handy to carry them with you... to read while in the bus and so... and you can't use the tablet PC in the bath too
Having said this, Kindle and other products are more suitable than a Tablet PC. It is hard for the eyes if you read for too long.
But if I can choose, I prefer the paper copy