Protopage = Google IG

Found this new service today c/o the Social Software Blog. Protopage is an AJAX-driven personal homepage. You can easily add RSS feeds from new sites that update automatically, create yellow post-it notes that you can move around without page refresh, and even create your customized wallpaper. Pretty sweet - its a version 1.5 of Google IG. Speaking of IG - can somebody tell me what that means?