Yeah, a lot of the auto manufacturers are coming out with the next generation of clean diesel within the next couple of years: BMW, Honda, and of course, VW and Audi. There are others, but I forget right now.
EDIT: Mercedes, I think, and Nissan, Toyota, Ford (of course), and GM (of course). Ah. (Regular gasoline cars take more fuel starting than running...for less than a minute [roughly]. More than a minute, and it becomes worth it, gas-wise, to stop the car and restart it. I presume by this that you mean, with diesels, that time limit becomes much longer, as in, long enough to fill your tank [10 minutes or so, with foam].)