I was given a Kindle about six months ago, and I have to say I think it’s pretty wonderful.
For travel - yes, but in the micro as well as the macro sense. I’m a reader who likes to pick up a book and read it any time, any place - in a commercial break whilst in front of the TV, in the car whilst waiting outside a shop, in the dentist’s reception room. The Kindle is perfect for this.
For keeping several books on the go. I have a heap of (hardcopy) books I like to read at any one time. The Kindle makes it possible to carry my virtual heap everywhere.
For re-reading the classics. How else could I take the complete Charles Dickens on holiday?
For buying cheaper books. How else could I buy the aforesaid Dickens for less than £2? Or most other books more cheaply than the equivalent print versions?
For reading any fictional story where the sting is in the tail. Harder to read ahead than with a print copy.
For not filling every corner of the house with physical volumes, and upsetting relatives, fellow occupants and Significant Others. (And thus requiring additional space, expensive shelving and more complicated house moves. And sadness when you have to give or throw good books away.)
For buying books quickly, easily, without fuss or much guilt. So much easier than visiting a bookshop - or even Amazon via a computer. Too easy, frequently.
I imagine that all these advantages may apply to other readers as well. At least I hope so, and that for the writing industry, including many of us, they’ll outweigh the greater opportunities for piracy that e-books provide. Based on my own experience, I hope that books will become much more of an impulse buy. Perhaps readers will collects books unread on their readers like food in a 'fridge.
Funnily enough, unlike Katherine, my main reservation about e-reading is reading books that are in any way technical. I want to be able refer back and annotate, a bit of a chore on a Kindle. The page size is also something of a disadvantage.
Oh, and reading to young children. Something tactile and colourful is needed there.
H