[bapadna]

My barber sends me a coupon at about the time I need my next haircut. That coupon converted me to a regular, even though I always forget to bring it with me. It reminds me to make an appointment with him, not one of the many other haircut options that I consider acceptable. He got my home address by flat out asking if he could have it after I was a walk-in one day.

My wife's favorite spa has also figured out that sending me follow-on ads is a pretty effective sales pitch, as I semi-routinely say 'hey, she deserves another half-day at the spa.' They got my email address from an initial online sale.

I don't get any follow-on advertising from donut places, but there's a local restaurant who uses email to fill out slow nights with some really nice prix fixe dinners. Every now and then one shows up in my inbox, sounds delicious, and I don't feel like cooking, and they make an additional sale. They started doing so after I made a reservation on OpenTable, and our dining frequency jumped substantially.