Regonline is an event registration service that facilitates attendance at conferences, trade shows and other similar events. One of their new features is designed to boost attendance by sending out a customized email to those who start a registration but then quit in the middle.
I think this is a really great idea. I know that a lot of times I have quit on a registration or entry form because it asked for too much information. I just didn't feel like I had time to complete it. Still, if I had received a followup email I think I would have been much more likely to go back and finish what I started. I would feel as though the company/business/conference was taking more of an individualized interest in me. I think that feeling would be true for a lot of people.