Love my 3G Kindle. Allows you to browse books and order wirelessly, and they'll download anytime you're in a 3G network area. 3G service is free.
Thought I was a book-lover 'til I got this. With the cover with inbuilt reading light it's the best gadget I've had in years. Most people who see it want one, and even my technophobic old mum has bought one!...
Only dislike is that not ALL books are available via Kindle, but it's a pretty good range and it saves me $$$ in book costs. Oh, battery lasts ages too, I've even used the light in bed for a couple of weeks without a recharge (runs off the Kindle's battery too). The Stephen Hawking-like text-to- voice function is a giggle but glad I'm not blind...
If you get a Kindle make sure you get a leather cover with light, and an Australian adapter for charging. For 189USD + p&p it was worth every cent.
Ipad's are nice, but alot more $$ for a decent one, and I'm not an Apple fan...
Cheers,
Cam