Hoping to generate more income from Google Adsense a lot of Adsense publishers are looking to find top paying keywords because the higher the advertiser pays for a particular keyword, the more the publisher earns.
The good news is that you can indeed find such keywords if you really need them. If you can afford - the best way to get these keywords is to pay for them. Many companies are specialized to do business by finding people good and profitable keywords not only for the purpose of higher Adsense revenue but also for search engine optimization.
One such a service can be found on "Top Paying Keywords" http://www.toppayingkeywords.com to getting relevant content on your site and increasing your revenue by a whole bunch quickly.
If you are not in the mood to pay for keywords, you can ultimately resort to a method of personal investigation. What it means is that you try out keywords by yourself and see which are the ones that work better.
Paying for the keywords could actually work better than the trail and error basis because at least you would be narrowing down search to certain items. However make sure to keep using Adsense 'channels' feature along the way as it will let you know which sections of your site are generating income and which aren't.
If you need any help, you can always visit Overture. Overture gives you the choice of entering keywords and finding out not only how much advertisers are paying to get them on the publishers page but also how many people are clicking on the words as well. This service can found out at http://www.pixelfast.com/overture/
You can also try out Word Tracker http://freekeywords.wordtracker.com. This tool will tell you how many sites are already using the same keywords. Try to avoid using the keywords that a lot of people are already using.
You can also search google for any keywords you may wish to include in your pages and verify the results. The results will probably be your competitors (and if they have Google AdSense ads on their page) while the links on the right display ads relevant to your search.
If your search does not yield any AdSense results on the right then you might want to reconsider including those keywords in your site. Make sure you don't use any dead keywords (words that don't get any links on AdSense other then public ads).
Of course these are only some of the methods that you can use to find out the top paying keywords. A lot of people with 'not so good' websites are generating a lot of adsense revenue by just finding out the most profitable keywords. But it is vital to remember that having the highest paying keywords doesn't mean that you will make the most money. You also would have to consider how to get traffic to these websites.
Note: This post contains affiliate links.