New reason #1-- Maybe I'm seriously behind the times here, but did you know that you can loan out books on your Kindle? I went to the Manage My Kindle page to clean up my library and noticed the "Loan this book" tab. Not all books are available for loan, but most of mine were. And one of my best friends just got a Kindle for her B-day, so now we can loan our books to each other instead of me just giving her my Kindle for a week (I really trust this girl, but missed my Kindle when she had it)
New reason #2--I went to Net Galleys (check this site out if you review books, it is awesome) yesterday to get an arc of a book I was asked to review, and they sent it right to my Kindle. And it turned out to be an awesome book that I stayed up past midnight to finish. I'll be a part of a blog tour in about a month, so look for my review.