How to convert files to Kindle DX?

If the ebook is in a pdf format, then you can attach it to an email and send it to "yourusername@free.kindle.com" and type "Convert" in the subject. "yourusername" is the part of your email you use to log into amazon without the "@email.com" part. It should only take about a minute for amazon to convert the file to kindle format and it will automatically be sent to your kindle via whispernet.