I'm in the same boat as you. I've been running my blog for 7 months now. I've yet to get a pagerank from google. I quit posting articles for about 3 of those months as I put all my effort into SEO, redesigning a new template, and looking for sites within my niche that offer dofollow linkbacks.

It's a tough niche to get linkbacks... but I still can't understand why I have a n/a pagerank after 7 months...