wordtracker vs. overture tool
 

which one to trust more? i'm trying several keywords, and overture almost always gives a much higher count than wordtracker.

rabbit

Overture is going to give you Yahoo, MSN, AV and others. Wordtracker is gonna give you (if memory serves) Mamma and a few others. They're both worth using, IMHO... but if you're gonna use one, make it Overture's Search Term Suggestion Tool... :2 cents:
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What hustler said..

neither overature doesn't know how to diferentiate between plural and non-plural words, and the difference is enormous..

use the google adwords keyword suggestion tool. :2 cents:

Use both.