>This guy makes some good points about being aware of the medium you use when delivering your message.

Always be reactivating: “Matching the offer and medium drives marketing ROI. A large telco increased conversion rates 300% using text messaging to sell text messaging. ABN AMRO has seen 32% conversion rates on targeted cross-selling of short-term insurance at ATMs. Sports Authority used voice mail to create, deliver, and measure campaigns in just a few days. Road Runner Sports increased revenue per email 300% using email to reactivate first-time buyers. The good news is that there are lots of media with different costs to pick from, but the bad news is that, like most interventions, customers get used to them and their effectiveness decrease over time.”