There are two ways to figure out what your approximate PageRank is. One, you can download the Google Toolbar (the PageRank feature is not turned on by default, so you’d have to enable it after installation).
The other way is to use the Google PageRank Calculator page on this website. It’s quick, free and requires no registration. Check it out. If you have a PR6 or higher, I’ll be very impressed.
Quick recap: Organic search is like free advertising. It’s worth the investment to try and get a high ranking by the major search engines. To rank high you should do two things: First, make sure your site has the right relevant content for the types of searches your potential clients are conducting. Second, try to get the highest PageRank possible. To do this, you need to get as many inbound links from as many high PageRank web pages as possible.