Making money on Google AdSense has a lot to do with posting articles with top paying keywords.  Here are some examples of topic areas where the keywords have gotten bid up significantly. Its also important to note that unique specialized phrases are ones that only the very interested will use.  Fewer hits but a greater likelihood of coverting them into paying customers.

  • Loans and mortgages.  Many people have an upcoming balloon payment and need to refinance.  Others want to pull some cah out or remodel.  Some good keyword phrases are "benchmark lending", "adverse credit remortgage", "adverse remortgage", and "refinance with bad credit".

  • Travel sites can generate a lot of money.  Here are just two examples of profitable locations – Lake Tahoe (most ads are for Lake Tahoe rentals and Lake Tahoe cabins) and Aspen (Aspen, Colorado, is famous for its ski resorts). There are tons more, of course.
     
  • Lemon laws tend to be a strange attractor.  It costs money to unravel a car deal, but often times this is the first time a person needs a lawer, so law firms have bid up the keywords.  "law lemon wisconsin", "ca lemon law", "law lemon ohio", and "illinois law lemon" are all top dollar phrases.

  • ATM Machines, if you play it right, can be a godsend niche. We kid you not. You can buy ATM machine online, you can lease ATM machine online, you can order a sign for your ATM and you can order ATM supplies, like thermal paper, all online.

  • Getting a patent can be very expensive. And often times the person or company that files their first patent with a firm will stick with that firm and file the next hundred with them.  For this reason patent attorneys can afford to spend big bucks on luring in new clients.  The payback for them can be substantial.

  • Car donations. Yes indeed – car donations. If you live outside US, this may not make very much sense to you, but people here donate their cars to charities and write this off as a tax break. Say, you have a total clunker that doesn’t run that you wanted to get rid of. You donate your car to charity and get a fat tax break for that year (the value of the car, which is often judged much higher than what the car you donated is really worth, had you tried to sell it).

  • Many law-related topics are good because law firms will bid up the placement.  Forming an LLC (limited liability corporation) or incorporating in Nevada or Delaware is getting to be a very popular. One reason is shielding yourself from lawsuits and other liabilities, and another one is the tax breaks corporations enjoy.

  • Breathalyzers And Alcohol Tests.  When people are in trouble they are willing to spend lots of money to fix the problem.  As an example, a recent article written by a Colorado lawyer talks about how to avoid false breathalyzer results.

  • Online dating services are very competitive.  Where do the lonely, newly single people hang out?  Those are the sites with keywords that can pay good dividends.  "american singles" and "online dating" are a couple examples.

  • Domain name registration.  One site on top-paying AdSense keywords listed "domains yahoo", "domain name yahoo", "domain registration yahoo", and "domain yahoo" in their top 10 list. 

  • Gift cards.  "best buy gift card" or "buy gift card" are a couple good ones.
     
  • Insurance topics.  Solving problems related to accidents or buying new policies are rich veins to mine.  "insurance medical temporary", "compare life assurance",  "life insurance quotes", and "term life assurance" are good examples.

  • Hair removal.  Obviously getting rid of hair has more value than regrowing it.  Try phrases like "dc hair laser removal washington", "hair laser removal virginia", or "hair removal washington dc"