INSURANCE is one of the highest searched keywords and therefore one of the highest paying ads a publisher can use. You can talk about anything marketable and the search engines will pick up on some of it. As an example I mentioned insurance at the begining of this article. Car insurance, or home insurance may have been better but as long as the word insurance is there the ads will show up. Same thing with MAKE MONEY. Make money is often used by marketers. So make money or MAKE MONEY ONLINE or MAKE MONEY FROM HOME should be easily filled by an advertiser. Half the seceret is to write something which relates to what you are trying to sell in order to fill your ad space. I like CAR INSURANCE because there are so many advertisers who what to sell on my ad space and CAR INSURANCE pays rather well.