also he tells people when he's exercising and dieting, which I understand is helping some of his fans stick to their dieting/exercising thing of choice

It very much does. Those days when I think "well, I could just skip today" David will pop up with "went jogging with Mars" and then I HAVE to go ;)

But I do find it utterly adorkable that he's jealous of Joe getting the buggy IPhone. Poor, poor David.