I have a Kindle Keyboard WiFi which I got on a trip to NYC earlier this year. I love it, I get a lot of classics for free as mentioned above and best of all, it works in any country (even my home country, where B&N doesn't let me buy stuff). I usually only read novels; textbooks are a hassle.
I'm currently reading the novels by Stieg Larsson. I wanted to know what all the fuss was about and they are really entertaining.