Santa Tracker has clearly made its mark on Google — things in Mountain View are beginning to look a lot like Christmas. But then, its probably much too difficult to resist the urge to sprinkle in a few references to Kris Kringle in a post detailing updates to your list-making app. And surely many a holiday gift giver will be pleased with the tweaks to the Web version of Keep, including full-color notes, text scaling, new fonts and the ability to rearrange lists.