I recently was pointed towards some very useful whitepaper hosted by one of our customer in Auston, Texas. QuantumDigital.
One whitepaper that 
caught my attention was one entitled, “Understanding Direct Mail Impact and ROI” and contains some interesting facts and figures as well as some common sense approach to implementing successful direct mail and integrated campaigns.
Marketers can expect a return of $43.52, $22.75 and $19.97 respectively, for every dollar spent on email marketing, direct mail and internet marketing.
It’s certainly worth a read and acts as a good reference to those still debating whether or not to take the drive into using direct mail in more effective ways; as well as providing compelling evidence to service providers about the potential from embracing this technology as soon as possible.
Other whitepapers available at the same location
- Best Practices for Effective Email Design
- The Bond Between Email & Direct Mail for Lead Generation
- The Power of Web-to-print Portals