Better typesetting for EPUB (and HTML)
Borrowing (extremely) heavily from http://www.bramstein.com/projects/typeset and http://search.cpan.org/perldoc?Text::Hyphen , Calzone fills in the gaps that reader software leaves behind, fiddling with the placement of words and paragraphs on the page to make e-books prettier.
There's nothing particularly EPUB-specific about Calzone, so if you like you can use it to improve the typography of ordinary web pages too. I wouldn't, though.
See http://simoncozens.github.com/calzone/ for a rigged demo.