If the crack is not bigger than a looney, crack-repair companies will be able to repair it. Do not delay, as cracks tend to grow bigger with time and *sigh* our beautiful roads!
I've had my MINI for almost a year, and that's what happened to me on my FIRST week-end while driving to get my set of summer wheels from the previous owner! Imagine how ****ed I was when I realized what had happened!
From what I have gathered, Lebeau is part of a bigger company while Duro is smaller. Apparently they both do a good job, but you may want to ask your insurance company (if you decide to declare the incident) which company they recommend. They fill the crack with a kind of filler transparent paste. Apparently you see a slight hazing effect when you look at it in the sun light.
As for myself, I had to have the whole windshield replaced!
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paco