When advertising, a very common mistake is squeezing too much content into a single ad or page. Seth Godin has a very good piece on that topic called Oldest remaining…a copywriting tip:
http://sethgodin.typepad.com/seths_blog/2006/10/oldest_remainin.html

Makes a very good read IMHO…

Related posts:

  1. Seth Godin on starting a Business
  2. Seth Godin on reading
  3. Seth Godin on giving and taking
  4. On fonts
  5. On giving raises