This is what is said about the Kindle. I have a Kindle latest generation and I am so happy with it, looked at many others and they could not even be compared.
Amazon offers an email-based service that will convert JPEG, GIF, PNG and BMP graphics to AZW. Amazon will also convert HTML pages and Microsoft Word (DOC) documents through the same email-based mechanism, which will send a Kindle-formatted file to the device directly for $0.15 per MB or to a personal e-mail account for free. These services can be accessed by sending emails to @kindle.com and to @free.kindle.com for Whispernet-delivered and free email-delivered file conversion, respectively, but these are services available just for those who bought a real Kindle device