Aimee got a kindle a year ago and never used it, so i commandeered it a few months ago and love it. I download PDF torrents and then convert them to kindle-friendly format using MobiPocket creator.
[HUUUGE sci fi and fantasy novel collection – every work of every author you ever heard of]
[MobiPocket Creator, conert pdf files into kindle-friendly format]
I also use Kindle Feeder, which automatically sends any number of newspapers/blogs/RSS feeds to your kindle wirelessly for free (not counting the 10 cent wireless fee kindle charges you). I highly highly recommend using kindle feeder. I get BBC news, TIME, life hacker, kotaku, the economist, and a couple others sent to my kindle twice a week. http://kindlefeeder.com/