PubSub is today expected to unveil a new site ranking tool - LinkRanks - that measures the "strength, persistence, and vitality" of links to and from a websites - and is also compiling lists and categorizing prominent blogs in what could be useful to media buyers and planners interested in buying advertising in blogs, writes ClickZ.

With LinkRanks, users can estimate the reach and influence of a webpage based on the sites that link to it. PubSub's category-based site rankings will be launched initially with "Fashionable Blogs" list, which combines a fashion expert's top blog picks with LinkRanks data on those blogs. Other topic areas will follow, according to PubSub CTO Bob Wyman.