Don’t know if this is useful but my WP blog is marked up for schema.org – Propeties For Sale In France – you can see this if you use the rich snippets tool from google on the link. Its pretty well covered even down to significant links being defined.
Two points of note: the site is very specific in its purpose (offsite landing pages for my property portal – [link moderated] Houses For Sale In France) but the same markup would apply to a general blogging site that most people have. Almost no differences. I modified only two core WP files which were link-template.php and category-template.php to really do some fine tuning on tags becoming significant links, older and more recent links too. The rest was undertaken in the theme itself which is one of my own quick creations (modified files are: archive.php, single.php, sidebar.php, footer.php, header.php and finally index.php). It takes about 40 minutes to do it once you have spent the 5 hours thinking about it – LOL. The last of the above mentioned files index.php was a little tricky as it has static content on it with the 3 latest blog postings embedded in the middle of the content.
Anyone wanting to know more can look me up on google+ which is given in the footer of the aforementioned site. Giving a google+1 to it and its sister site which also fully marked up is always appreciated.