I often see the web pages of companies and individuals full of all possible things they can do and just wonder what they really do and what they really have experience with. Perhaps this strategy (we can do everything) only dilutes their message.
The best lesson I have learned so far in my life (after doing the exact opposite) is do less. And it has changed my life, for better.
With do less philosophy, you do not try to do every thing you can do; you try to do the best thing you can do. And the best part is you are going to be happy with your life and there is a good chance you will make more money too.
This is what Seth Godin tries to convince us in the attached 7 page pdf.