In an uphill battle to compete with extremely popular personalized homepages like Netvibes, Pageflakes and Wegwag, Google has expanded their own offering today. The recent trends of people keeping track of their favorite sites with syndication modules has led to these personalized homepages offering many tabs for people to organize their selected content. Previously, you were only allowed to have one page on google.com/ig.
This seems to be the only feature roll-out for Google's Personalized Homepage today. Users can add all the same modules to their new tabs as well as name them whatever they like.