The following is from an article in the Charleston (S.C.) Business Journal:
In a May 2008 study of consumer attitudes conducted by the research firm Ipsos for Habeas Inc., 67% preferred e-mail as the primary method of personal and business communication. A majority (88%) said they would like organizations to give them more choice over the content and frequency of e-mails they receive, including ads, offers, articles, newsletters, white papers and other content.
This is exactly what I covered in the Email Marketing 101 presentation I gave last week to the Atlanta Web Entrepreneurs Meet-up. Knowing what your audiences wants - and how often they want it - is critical to your email program's success.
The article went on to give an example of how email can be effective when combined with other components of the marketing mix, such as a direct mail piece in this instance.
h/t: Douglas Karr