Obviously, it depends. But here are 3 suggestions to get good content flowing:
1. Original content. Linking/re-posting content created by others is usually encouraged, and is almost always allowable. However, publishing articles that aren’t posted anywhere else gives your post a huge advantage. It also works to establish yourself as an expert in your industry.
2. Answers to common questions. What to customers and friends ask you? When people find out what you do, what questions do people ask? For example, I have a friend who works as an auto-mechanic. When I want an honest opinion about something related to my car, I call him. Think about what your friends consider you to be an expert in, and start recording your answers on your blog!
3. Specific, instructional information. “How to change your own oil.” “How to check tire pressure.” To an auto-mechanic, these answers seem obvious. To many of the rest of us, this would be very useful information. 
What works for you?
CauseChatter (The Coudrain Group) 