The Droid may read ePub files and I'm pretty sure it will read PDF files, both of which are available at this site.

If I am not mistaken, you will have to run the ePub file through a converter to be able to read it on a Kindle. I don't think (I may be mistaken) that there is anything you can do with a PDF file on the Kindle.

The Nook and NookColor will read both formats.

This is a neat site - thanks

Adrian