I just finished a monster post to the CIMLS.com Blog about using mail merge to build a customer base and posted it to Hacker News (upvote us if you can!):

http://news.ycombinator.com/item?id=3077006

This information is targeted at folks new to sales (ie most engineers who move into a start-up environment).  If you have a cool product or service that you've been dying to promote. This guide is for you!