I looked up words that have always tripped me up, including banal, brood, indefatigable, preternatural, conch, niche. Indefatigable, banal, and conch had some conflicting ones but the "correct" one occurred enough times that I got the idea. ("Brood" probably isn't commonly mispronounced, I just got it mixed up early in life and never quite got it sorted it out. :)
The results for "niche" are consistently mixed up though, which means that word will continue to drive me insane. Neesh or nitch!? I mix it up when I use it without any rhyme or reason.