Yahoo went on a tear last spring, closing down more than a dozen underperforming services as part of a broader streamlining effort to focus on core products. Over the past year, the Internet pioneer has continued to evaluate some of their less popular products and is once again performing a cleanup job that’ll see several more services bite the bullet. Some of the changes have already taken place. For example, Yahoo shut down the Newlook service, an online virtual makeover tool for maktoob.yahoo.com, and the ability to generate research reports on Yahoo Finance on April 30.