Hi Rob,
Yes,direct mail is cool.The likeliness of getting a physical letter opened is always higher than that of an e-mail and with an attractive sales letter almost anything can be promoted.

Direct mail is something that is often been considered out of mainstream internet marketing.Most of the marketers think about this art as someting outdated,time consuming and less profitable than online methods of getting traffic.

One reason behind this thinking may be the lack of quality information on this topic.Apart from the "12 month millionaire",very few courses are available on this topic.

Thanks,
Vivek