1. If you have a Google AdWords account, pretend you are planning to advertise using different keywords, and see how much you'd have to pay. That will give you a good indication of the popularity of the keywords.

Here's how. Follow these steps. In step 2, "Create Ad Group", click on "Calculate Estimates" and "Recalculate Estimates". These show you the maximum you would have to pay per click to advertise for particular keywords or key phrases.

For finding new key phrases, you can use Go to Google's AdWords and find out how much advertisers are willing to pay for the keywords or key phrases you're interested in. Here's how.

Go to https://adwords.google.com/select/KeywordToolExternal and play around with the free Keyword Tool.

For example, try putting in a keyword or phrase, such as "book" and click on "Get More Keywords". Pretend you're willing to pay the maximum per click the tool allows - 100. (You can choose any currency. I chose US.)

Over on the right side of the page, make sure that "Cost and position estimates" is selected.

The tool will calculate for you the estimated average CPC (cost per click) for a whole lot of words and phrases. Try entering a different word, say "debt" or "free", click on "Re-calculate" and watch how the CPC changes.

You DON'T have to choose a topic which has expensive keywords. Often topics that have expensive keywords are very competitive. You may do better choosing a less competitive niche with cheaper keywords.

2. Keywords Analyzer is a superb tool which can generate thousands of key phrases that people are typing into search engines. If you have a Wordtracker account, you can also import data from Wordtracker and analyze it. It shows you, for example, how many advertisers have ad campaigns at AdWords for each phrase. If you're using AdSense, the more advertisers the better!

3. Have a look at the top 100 keywords on 7search. This will give you a quick idea of keywords that people are willing to pay big money for. You can also type phrases into the 7Search Keyword Suggestion Tool. This is just step one of your keyword research. You'll want to dig deeper.

4. At FindWhat pay-per-click search engine you can do a search for any phrase and quickly see how much advertisers are paying per click.

5. You can experiment typing words into Yahoo! Search Marketing's View Bids Tool. Let's say you type in "asbestos cancer". The top three advertisers often pay about $12 per click. So that might be an good choice for a topic - provided you're a specialist on mesothelioma AND provided that your research shows that it's an in-demand topic.

For "debt consolidation", the top two advertisers often pay more than $9 per click.

6. The free Web Marketing Keyword Bid Research Tool speeds up your research at Yahoo! Search Marketing. Type in a keyword and learn how much advertisers are paying per click and also find out how many searches were done on that keyword last month.

However, you need to know that Yahoo! combines singular and plural phrases, and robots are used to check bids. Both of these factors tend to distort the results you'll see. Checking Yahoo! Search Marketing is good for quick, rough research, nothing more.

7. You can use Wordtracker to look for the 1,000 most popular keywords. You can also use it to compile a useful list of keywords relating to one topic. If you buy it for a day or a week, you can do a lot of research in that time. It's the tool the professionals use.

Wordtracker has a free trial, but it's fairly limited. You can subscribe for as little as one day and do an awful lot of keyword research in that time. I have an annual account because I use it so frequently for keyword research.

8. The brainstorming and research tools in Site Build It! are my favorite way to do brainstorming for keywords that are in high demand and low supply. SBI is a superb tool - actually, a suite of tools. It's an all-in-one web hosting, site-building and web marketing tool. Type in a keyword and SBI Manager will present you with dozens of profitable keywords - ones with high demand and low supply. It can present them in order of profitability. Drill down, and you'll get dozens more profitable keywords.

SBI also has an "Analyze It" tool that helps you build keyword-rich pages that rank highly in search engines. It's simply superb. I use it and love it.

Site Build It! is an excellent choice for quickly building large, simple sites designed to rank highly in search engines - which makes it perfect for generating lots of AdSense revenue. Check it out.

QUICK SUMMARY: Build useful, simple sites - one topic per page - using valuable key phrases that are high in demand and low in supply. For researching, building and promoting easy-to-build sites that rank high in search engines, there's one suite of tools that's head and shoulders above all the rest - Site Build It!

Site Build It! builds sites that work for ANY small business. See the proof...