i noticed that "linking popularity" (i give this name to it.) linking popularity is a number of links you get nowadays or lately time period. i believe google gives more chance to who has a good "linking popularity" then static pagerank. Couse my blog has pagerank 0 but it is on 5th result at google the word i want. When people gives up linking my google rank decreases. Do you noticed something like that?Do you believe it? or Am i the last person who find outs it?
Maybe your site do have pagerank and its just an error in the calculation of your site pagerank that showing 0 pagerank. sm-insurance.com
Check your PR with some of the tools and then get back.Also it may be that you are targeting a keyword which is not competitive.
PR has nothing to do with your rankings but link popularity will help you improved SERP, since link popularity is based on the number of backlinks of your site from search engine. By using your targeted keywords as anchor text, this may help your rankings.