Can i just make a geeky comment? I know I'm being an html snob, but the html produced by BookDesigner is truly truly horrible. It breaks just about all of the rules for writing valid html (no paragraph tags! no heading tags!).
I don't think this is entirely an issue of snobbery. Future ebook formats will be based on xhtml and while i suspect they will need to work with non-valid xhtml it's got to be an advantage to start with a properly marked-up reference source text as the basis.
OK flame me now.