Review my startup: Parking Ticket Reminder/Payer
sounddust: I'd put a big disclaimer in there somewhere that you're absolutely not responsible for late fees or anything else if your service fails.  Not just for legal reasons, but because there are many non-technical people that don't understand the possibility that a service like this could fail (not to mention the small group of dummies who will undoubtedly think that your website is sanctioned by the state of CA).