I travel a lot on business (>150,000 air miles last year, without ever checking a bag) and a Kindle is a great way to carry reading material without getting weighed down. My newspaper subscription, for instance, is on the Kindle, and other than some funky formatting issues, I prefer it to the tree-and-ink version.
The free books available electronically are another great feature. And a free software called Calibre works as an essential middle-man between the source of the book and the Kindle. Go to Calibre and download the version that works on your computer or portable device.
Now you can work with anything published in standard epub format.
Say you want one of the hundreds of excellent books and articles from the Ludwig von Mises Institute. Go to their site and track down what you want to read. Let's say it is Leonard Read's classic article I, Pencil, which is free of charge.
Click on it and download it into wherever your downloads go. Open Calibre, and click on the Add Books button. Browse to your Downloads folder, highlight the I, Pencil file and click the Open button. Calibre brings the article and its cover illustration into the Calibre Library on your computer. Then plug in your Kindle and click on the Send to Device button. Keep an eye on the little wheel at the bottom right of your screen...it takes a bit of time to squeeze the book through the wire.
Done. Now you can read the article for free. Plus you can use Calibre to manage the books on your device.