MacSparky's Field Guide for Email
My friend, David Sparks (MacSparky), just released his latest Field Guide: EMail. In true MacSparky fashion, there is lots of useful information for both novice and seasoned email users. At the end of the iBook, David includes interviews with a broad range of professionals (including yours truly). This, and other MacSparky Field Guides are well worth the ten bucks. Check them out.