I was going to mention Calibre too - excellent program. Kindle does not support EPUB files, however, which is a shame.
When it comes to PDFs, however: if they contain anything more complex than plain text, maybe a picture or two, then I just find that conversion to any eBook format is a bad idea. PDFs are designed to render complete pages that look the same on both screen and paper, while eBooks are continuous text that should work on any size screen. So I much prefer to see them without conversion.
Last edited by bnt; 8th January 2012 at 09:20.