FACT: Google reported revenues of $5.7 billion in the 4th quarter of 2008 an 18% increase from 2007 Q4. Most of this revenue comes from Adwords pay per click advertising.

But knowing which ads work and which don’t is essential to the success of a Pay-per-click campaign.

One way of finding out what works is to split-test different versions of ads and see what gets the highest click-through-rate (CTR).

If you are using PPC to promote affiliate products you not only need a high CTR but also need to know how well your ad will convert, or else you will lose a lot of money testing different ads and different affiliate programs.

One way of finding ads that convert is to see if they appear week after week. If they did not the advertiser would not be wasting money on them. If an ad is displayed for 90 out of 100 days, then it is likely it is working. If it only appear for 3 days, then it probably does not.

Now what if you had a database which has been tracking 2,5 million keywords for months!

What if this database could show you exactly how many days a particular ad had been displayed, and how much the average cost per click was for the advertiser?

Well this is exactly what Google Cash Detective does. It allows you to identify ads which are working, and you can then go and set up a similar campaign with 95% confidence it is going to work for you too.

Google Cash Detective is perfect if you are want to use PPC to profit from affiliate marketing, and if you are not, it is worth checking out to increase your learning on how some people are making big money from PPC.

You can get more information at http://www.searchgap.com/1/gcd