Thank you for sharing the tips, anny feng. That's helpful. I would like to add some as well. How about link exchange? This will help increase your page rank if the link you are exchanging with is unique. You can even take part in various forum discussions and from there you can benefit from increasing page rank in your site when you put your site link in your signature. If you write articles, you can pass your site link there that is related to the content of your articles and with luck you can get
PR from this backlink. Then make a subscription newsletter, it's another way to get your
PR rank up especially when traffic visits your site feed.