How to find the hottest keyword?

For me, keyword its not an important thing to get traffic to your blog.. The most important thing is the content of your blog must be relevant with other people needs. But if you want to "steal" keyword, I'll list down the tools to find your "hottest" keyword..

• Google Adword Keyword Tool -Keyword list sorting. Sort the results of your keyword search by popularity, performance history within the AdWords system, cost, and predicted ad position. Simple keyword manipulation. Select a few keywords here and there, or add them all at once. Keywords already present in your Ad Group will be marked so that you don't have to worry about them. You can also download your keyword list as a .csv file.
• Free Keyword Suggestion Tool From Wordtracker- People use different words when they search for your products online. Use these 'keywords' in your website copy and people will find your site when they search.
• Black Hat SEO Keyword Tool - Find your keyword list without taking a long time