iGoogle ( personalized Google homepage ) has been completely evolving and is now experimenting new features mostly open-social, take the survey and let Google of about what you feel about the new features. Looks like iGoogle is inspiring from netvibes.com (multi-lingual Ajax-based personalized start page much like Pageflakes, My Yahoo!, iGoogle, and Microsoft Live.)
You can sign up for the developers sandbox at google.com/ig/sandbox, although not all the features work as expected.
It will be have Left navigation, Canvas view gadgets, Chat and connectivity to open-social apps. Complete details here.