Not yet but I'm working on it (meanwhile you can try a rst2latex.py on the sources) for a very rough draft.
Amazing work. If you take a look at latex please consider also XeTeX for its beautiful font support. It can give a lot of satisfaction when packaging good content. Microtype is also nice if one sticks to pdflatex.
I've failed to build pdf from book.tex produced by rst2latex.py (the issues are likely fixable if you work with latex).
I've converted the rst files to e-book using rst2html.py + calibre instead.