The latest version of Google's sophisticated anti-spam algorithm, dubbed Penguin 2.0, was announced yesterday in an official blog post from the company's well-known webspam czar, Mike Cutts. The 2.0 label was applied, according to Cutts, because the update is a major one -- it includes changes to the underlying algorithms used to evaluate whether a website is spammy or not, not just the dataset Google uses. About 2.3 percent of queries in U.S. English will be visibly affected by the changes.