rob,
Google Toolbar PageRank gets updated no more than 4 times a year, usually every 3 months but sometimes longer than 3 months. I believe the last update was the end of April. Everybody is/was expecting a late July / early August update, but July has come and gone and we are well into August.
Until Google does another pagerank update, your site won’t increase. You can’t speed Googles process up no matter how hard you try. They do what they do. Everybody would like quicker updates 
Keep doing what your doing. Keep adding content, unique content is the best. Keep building links. Increased SERP’s and PR will come from them. Search engine position updates much more often and is much more important than PR unless your selling links.
Once Google does their next PR update you should see an increase in pagerank from the link building you have done.