OH, i made a post about this the other day. Acrobat professional export to HTML works well (or RTF) If you don't have pro, you can do export to TXT on the free reader version and it won't do images. However, images that have text combined with them have cause some slight issues (like graphs will have the axis labels stripped from the images) However, text will flow from columns and be very readable.
http://www.adobe.com/products/acroba...linetools.html
Adobe lets you convert free online, though for me online won't do images. Perhaps if you email it they will send you a document with images, I have not tried.
There are other programs out there, another I have found that does essentially the same thing as adobes is "Easy PDF to HTML converter"
It is probably based upon the same code or something because the output files are nearly identical.
http://www.pdf-to-html-word.com/
note there is a word and html version
get html because ebook programs generally don't like to deal with word, they like html.
There are other programs just like it, with the same gui and back end, that make me think that it's an open source program that someone compiled and sold to make money. I didn't pay for it. I wouldn't pay for it, because I think it's dishonest to sell software you didn't code yourself. And I don't like buying software that does niche things. If you look hard enough you can probably find the "free version" out there, though it is probably command line based.
It may be sourceforge pdf2html, but I am not sure of this.