I was doing some keyword research with google keyword estimator, planning on using the results as ballpark estimates, but then I read that all the estimates are basically a piece of shit. So, are there any other (free) tools that give more accurate results, and should I just use my best judgment and run the campaign with around 50 keywords and tune from there? I'm also going to launch it on yahoo if that makes much of a difference. I figured the keywords wouldn't change much from engine to engine