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New sites may be taking a longtime.. 6 months? to start ranking well. The theory is called sandbox, do a google search for site:www.webmasterword.com sandbox and your'll find all the posts, mostly in google news section of this forum.
Sandbox may or may not exist, its just a theory. A good suggestion was that new links in to a site take time to mature, in otherwords their pr is not forwarded until they have been there for a while.
The pagerank tool is not giving accurate pr imho. It is way out of date, you may well have pr but it does not show. Get on theme links in and keep building great content :)
My guess is that google is still calculating PR, but not showing it to the public (in the toolbar).