Let's say your client gives you a few keywords to target on their website which is a PR 2 or a PR 3. Do you put the keywords on the homepage and build links to the homepage? Or do you write separate blog entries for each keyword and optimize the article (2% density, title, pics, h1, h2, bold, underline, etc) and then build links to that specific article page? Or both? Obviously the article page is better optimized for the keyword, but at the same time, it is a brand new page with no page rank compared to the homepage.