Using google to search for blogs will throw up a whole load of sites that aren't blogs. If your looking for blogs what you need is a blog search engine. In fact google have their own blog search site, here.
If your on a mac, you can try out bloglight. It's an application that searches via 4 main blog search engines (Feedster, Google Blog Search, IceRocket, and Technorati). It looks abit like Spotlight for blogs.