I'm sure some of you are aware of the new Kindle Cloud service now available from Amazon. For those of you who are not, the absence of Kindle software for Linux has finally come to an end and we can now enjoy Kindle content in Linux. If this was the main reason you weren't switching over, let me hear you say "Hallelujah!"
There is one requirement for Kindle Cloud: you have to have Google Chrome (or Safari, but hey, we're using Ubuntu, not something from Apple). This is not a downside for a lot of us, as Chrome is a common (and excellent) browser. I have it installed on my laptop, and I have installed in Chrome the Angry Birds app as well as the Kindle Cloud app. A lot of other apps, free and paid, are available, essentially turning chrome into an android console. Great idea!
Upsides: You get to read your kindle content on your Linux computer. This was the main reason why I was keeping Windows 7 on my hard drive. I have now wiped it off and am running only Ubuntu, again and finally (until I am required by my school to use windows 7, which is likely). This particular service is important to me since the kindle e-reader is so flimsy (it breaks WAY too easily, as myself and my wife can attest to after having broken two of them in just over a year). Kindle Cloud also has a very decent UI that is clean cut, easy to use, decently fast, and feature-rich.
Downsides: you don't get to keep book files on your own computer per-se. However, Kindle Cloud does support reading offline (using HTML5), which, unless you're planning on doing something unethical, makes this entire argument moot.
So, enjoy your reading and your cheap books and thank Amazon for finally finding a way to appease both copyright holders and end users at the same time, and for finally coming to their senses and extending support to Linux users as they should have done right from the beginning.