Great stuff!
I guess if Rich is a whippet, I'm more like a labrador. I have reasonable speed when I stay fit, but can definitely pack on the pounds if left unsupervised with food available.
I, too, am really aiming to get mileage up, but for me, it seems that my time improvements have all exactly correlated with a corresponding decrease in weight that comes with more miles, since I'm not so good at the diet control thing.