I created my site about a month ago and have been working diligently to improve my site through link exchanges, directories submissions, SE submissions, blog entries, etc. How long does it take for a person's PR to improve. If ever. Also, what factors are involved with improving PR? Is that the usually criteria that helps to improve a site's ranking?? Check out http://www.doc1vitamins.com. I appreciate all constructive critism. Vilash