Calibre is also useful for keeping track of what you have read. I set ratings only on books I have read, so it is easy to see at a glance whether I have read something. Also, I have a tag (Kindle, I'm so imaginative) that I add once I move a book onto my kindle. If I ever get 2.5, I will have all my books in collections, making constantly checking a tad harder.
You will love your kindle. This is definately the place to come if you have any questions or concerns. Congratulations!