I'll be curious to hear what people say. We're transitioning our son too. He turned one yesterday!
He stopped using a bottle a few weeks ago, but he still drinks formula from cup. We're just finishing what's in the open can. I've given him whole milk in his cup, but he didn't seem too crazy about it. I've started mixing the two in order to gradually get him used to the taste. I've also started cooking his morning oatmeal (his usual breakfast) in the milk. I figure that will help and it gives him additional nutrients as well.