Automotive email blasts are another clear opportunity for great success. Sure people don't buy cars that often, but when they do it is typically a huge purchase. Even better, most people become fans of a given brand. My wife is a Honda gal, my parents seem obsessed with Dodge products. People develop habits and familiarities with brands that keeps them coming back, often times despite problems along the way. This can't last forever though. Email campaigns targeted at impassioned consumers is a great way to maintain the experience and keep the consumer as a fan.
One particular brand that does this particularly well is the Mini Cooper brand. They have a private club that only owners get into. Sure this extends beyond emails, but you see this thematic experience oriented approach through out the emails they send. It isn't just about getting a car, it is about being a part of something bigger. I can honestly say no car I have ever purchased tried to make me feel that way.