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Thanks, but these keywords ("concurso tst 2012") have 1% for more than a week today.

Thanks a lot.

But, why this keywords are so easy still a mystery to me. Is there any reason for a keyword that has some competition around it to have a 1% difficulty?

We were able to rank very well for a specific keyword. After signing seomoz I've figured out that this keyword has a difficulty of 1%. All the other similar keywords I've researched have difficulties greater than 20%.

Is the Difficulty related to my site? Or is it absolute?

We've got fantastic results from a keyword here. After we signed up for SeoMoz,  we found that, for luck, this was a very easy keyword (1%) to rank for.

How can I find more easy keywords?