Do low level PageRanks help my websites PR?
All incoming links count towards your total, but lower level PRs (0-3) don’t count for a much of that total immediately. They will probably add more PR later, however, as their own PR’s increase, making all inbound links valuable. Keep in mind that theme relevant links from theme related pages provide more power in Google and the other search engines than unrelated higher PageRank links. Always remember that PageRank is only one factor in the search algorithm.