How do I generate a document (.rtf, .doc, .odt) from R

Here is my solution. It uses Sweave with reStructuredText markup which allows easy generation of odf, Latex and HTML documents from a single source. See here for different writers included in docutils.

There is also rst2wordml writer that doesn't implement all the features of rest, but you may find it also useful. It works with the example from my blog (first link) if you remove the table of contents directive.