I found an article that debates whether Google PageRank matters. According to the author, PageRank matters because he sees it as a credibility index. Higher PageRank means a better site.
I guess that works if your site is for other internet marketers. Ordinary folks don’t won’t have the Google toolbar installed, and couldn’t tell you what PageRank means if you held a gun to their heads.
If you want to be successful at internet marketing, make sure that your visitors are your highest priority. PageRank is secondary to making sure that your visitors return to your site (and tell all their friends).