If you want to convert files for free, there's also
eBook Express. It's based on ReaderWorks, and it accepts DOC, .RTF, .HTM/.HTML, XML, .TXT, .WPS, .WPD, .WRI and ASCII as source files.
Using this, you never have to download anything. :-) I used it to create
my free U.S. historical document eBooks.
Steve