If you own a Kindle, YOU NEED THIS app, seriously. Ever see an article online that you want to put on you Kindle? I don't know what you do to get it there, but I copy and paste it to Word, and either convert to PDF and manually transfer, or transfer as a Word doc. This changes EVERYTHING. Installing it as an extension to Chrome, Firefox, or even Android, it creates a button on your toolbar; once clicked it automatically converts it to an extremely nice format and sends it as an email to your Kindle email, which automatically send it to your Kindle (when your wireless is on). It works like a charm and is invaluable, and FREE!!! Crazy! I recommend you do it NOW, NOW, NOW.
The only thing, remember to use your '******@free.kindle.com' rather then '******@kindle.com' for transferring. This may sent save you a couple bucks depending on your Kindle email settings. Anyways, enjoy!