SEARCH GIANT GOOGLE WEDNESDAY LAUNCHED a search engine exclusively for blogs, entering a market that has thus far been dominated by niche search engines like Technorati.com, BlogPulse.com, Feedster.com, and IceRocket.com. The feature, located at BlogSearch.Google.com, is still in beta testing. As of yet, there are no keyword-related ads alongside the natural search results. Google announced the...