A blog is best tool in your Internet marketing arsenal. Why? Search engines spider (check for updates) blogs more often than average website. The reason for this is that blogs provide a continuous stream of new content from author plus reader comments.Three Big Reasons Why You Should Blog
Reason #1: A blog gives your book more exposure on web, thanks to pinging services (pingomatic.com) that alert search engine spiders and newsfeeds every time you post a new entry. You also have option of submitting your site to top blog and RSS feed directories for an even wider exposure for your book. Another resource is Blog Explosion, which is a traffic exchange service. For every blog you read, someone else will read yours.
With a website, you are limited to submitting your site yourself or paying submission service to do it for you. Then you can only submit once a month without any guarantee that your site will get listed. Submitting more than once will run you risk of getting blacklisted as a spammer.
Reason #2: A blog not only establishes your expertise in your genre/topic, but allows you to build one-on-one relationships with your readers. Your blog is an excellent tool to build your fan base. Take time to answer your reader's comments. Once you develop a relationship with them, more likely they will buy your book. If they like your book, well . . . need I say more? I was surprised to find that very few bloggers take time to network with their readers.
Also, search major blog directories for blogs that interest you and participate in their discussions. Enter URL of your blog or website in your signature. Then offer intelligent feedback on topic being discussed. Don't pop in with a "hi, bye" comment. That's considered comment spam, which is frowned upon in blogging community.