Copy-writing checklists
The Four U's [Michael Masterson, Early To Rise/AWAI]
Usefulness
Ultra specifity
Urgency
Uniqueness

Seven Secret Qualities of Successful Information Products [Gary Scott, Early To Rise]
  1. Is the Idea Interesting?
  2. Is the Idea Legal and Ethical?
  3. Is the Idea Attractive?
  4. Is the Idea Feasible?
  5. Is the Idea Understandable?
  6. Is the Idea Timely?
  7. Is the Idea Saleable?