Turning complexity into clarity.

If you're choosing a topic with the goal of writing for cash, look at what fetches the highest Adwords costs. Adwords is the flip side of AdSense. Google charges for the premium words and you can write on those premium topics. When you do that, the Adsense generated ads will be complimentary to your content. Yes, this is pandering. You're either going to write for passion or profit (hopefully both). If you choose the latter, here's a recently generated list of topics / keywords that fetch the big money:
  1. Insurance (example keyword: "auto insurance price quotes")
  2. Loans (example keyword: "consolidate graduate student loans")
  3. Mortgage (example keyword: "refinanced second mortgages")
  4. Attorney (example keyword: "personal injury attorney")
  5. Credit (example keyword: "home equity line of credit")
  6. Lawyer
  7. Donate
  8. Degree
  9. Hosting
  10. Claim
  11. Conference Call
  12. Trading
  13. Software
  14. Recovery
  15. Transfer
  16. Gas/Electricity
  17. Classes
  18. Rehab
  19. Treatment
  20. Cord Blood
* compliments of http://techcrunch.com/2011/07/18/most-expensive-google-adwords-keywords/

Do you want to go for the gusto? Here's a list of the top 100 keywords that fetch the big coin: http://wpmarketing.org/2009/08/the-top-50-most-expensive-adwords/