Not that I have had that problem yet (lucky/smart, whatever) I have had a few friends that did. One was in indiana and aparently the case actually got LOST, as in someone misplaced the paperwork. It has been 4 years since he was pulled over and he has not heard word one about it. Lucky bastard.
Other than that, the other guys got lawyers, and all I can say is DEFINITELY, GET A LAWYER!! They can work wonders for you, of course they work wonders for your bank account too, but I would rather go into debt fighting a DUI than have a DUI.