Well, considering PR for your site is calculated by the sharing of PR from all the in-bound links to your page. Each link to your blog carries with it and passes PR value to it.
I would get started building backlinks to your site from pr2+ domains ... create some web 2.0 properties and fill them with some decent and semi-unique content and point them to your site, then backlink the web 2.0 properties, then use rss feed submits to get those backlinks indexed.... and then wait
it seems from other posts i have read on the subject of PR that google has not updated page rank for some months now