The Google wonder wheel:

go to google and type in a key word, example “tablet computer”

when you get the results just under the Google search you will see “web + show options” click this and you’ll get a new left column with lots of options.

go to this list utill you see “wonder wheel” now click this

you will get what looks like a wheel with key words related to what you have just searched.

Now select on of the key words to get even more targeted information so in this example click on “apple tablet pc” and you’ll get some long tailed keywords.

Now you can use this information for your SEO or add campaignes.

Also check out the “Related searches” and “Time line” options on the left hand side

How cool is this? Have fun

ps if you are looking for Tablet Computers check this site out – Tablet Computer Review

Keyword research is dome with the help of technique called KEI where K stands for Keyword, E stands for Effectiveness and I stands for Indicators. KEI is a number with two to four decimal places. Words that are rarely used in search will have a very small KEI (near 0) and keywords and phrases that are extremely competitive will also have a very low KEI. The higher the KEI the more likely it is that you can achieve top rankings for the keyword or phrase and it will be worth your while because enough searches are conducted to warrant giving the keyword some attention.

By knowing which keywords you want to focus on, the subject of your article will become apparent. Additionally you ‘ll know which words to work into your text (don’t overdo it) and you will also use those keywords as the anchor text (the words clicked) for any links in your article or your resource box.