My Kindle.
It's the greatest thing since sliced bread. Or possibly beer.
I can't get over just how ace this little gizmo is. I was a little bit uncertain about them at first for a few reasons, namely: Cant read it in the bath, eyestrain from staring at a screen, not being able to read it at work/on choppers due to electrical device rules and the fact that it's well, a bit shit-looking.
Now though having bought one and used it for the past month I can't get enough of it. The nifty waterproof 'case' (it's more of a bag) I've got is an obvious help - I've got no worries about getting it wet when reading in the bath or by the pool - shit, I can read IN the pool if I want! It's also handy for tying onto the bars of the exercise bike in the gym out here and having something to read whilst cranking out an hour in the saddle.
I've got a UK amazon account so I can get books for about a 10th of the price that bastard rip-off aussie booksellers charge and if I ever feel that even that's a bit expensive I've got a 1Gb folder full of books (that's about 500 novels) given to me by a mate that should keep me going for years!
The screen isn't like an Ipad's so there's no backlight, no glare and a single battery charge can last up to a month! It weighs bugger all and thanks to the good folks at Gelaskins it now looks awesome with it's new hot-chick artwork.
Definitely the biggest lifestyle-changing gadget I've found since the iPod.