To know how many web sites have keyword in title USE

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allintitle:"your keyphrase" for Google
intitle:"your keyphrase" for MSN
intitle:"your keyphrase" for Yahoo
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This will show how much sites are using exactly this phrase in page
title. As page title is one of the factors that search engines are
using to give their results - this is also important.

So, using these two factors you will see hidden treasures - I
guarantee you. I cannot disclose keywords that I and some of my
clients found, but in any niche you can find really golden
keywords/keyphrases that get nice traffic and are not grabbed by link
builders.

Knowing the REAL level of competition, you will know how much links to
build.