A blog can easily be added to an existing website.Blogs can be easily customized to suit your requirements and to match your site. A blog can be Stand alone as a website.

As we publish fresh content on blog alomost weekly, daily or even more frequently, blogs offer our visiotrs latest information.That content will attract natural and unreciprocated incoming links. The bring valuable PageRank transfer, along with fresh visitor traffic.

If your content is sufficiently interesting and informative, two types of blog links will occur. One is the home page permanent link. The other is the specified link for a particular blog post and that will bring PageRank from an internal page.

Bloggers like to make link exchanges and often they have no idea or concerns about Google PageRank. Many have never even heard of the concept. Some very good PR5 and PR6 home page blogs are blissfully unaware of that fact. They care about exchanges for traffic and interest to their readership, and will readily swap with blogs they or their readers might enjoy.

Another is bloggers, in general, make link trades with other bloggers who write about the same theme. The on page text usually contains similar content, and often the same keywords, in both exchanging blogs.

The blog section of your website will add PageRank very quickly, often achieving a PR4 or PR5 within only a couple of months of existence. You can link that page, to any pages of your existing website, and provide that page with a PageRank boost. This is especially helpful if you are in a highly competitive keyword area.

Source: http://www.globalprblogweek.com/archives/blogs_and_google_pag.php