PageRank isn't as important as it used to be so don't place too much emphasis on PageRank in your Internet marketing strategy.
If you want to increase your PageRank just increase the number of high quality, reputable sites that link back to yours. If you care about search engine rankings, make sure the sites have content that is relevant to yours.
Here's a good post on the topic:
Improve Your Google PageRank: Google PageRank Explained



