Yahoo Challenging Google Adwords

PC World has an article about Yahoo's revamped Sponsored Search. I haven't tried Google Adwords yet as I'm still trying to figure out what keywords I'd use for ProductCritic. Since Yahoo only has 22% of the US search market vs. Google's 63%, you might be able to buy keywords for cheaper with Yahoo's Sponsored Search. Since you can't use Adsense and Yahoo ads together on the same site (even if they don't appear on the same page), I'm sticking with Adsense until I have a much better sense of what's working and what isn't.

One of the tools I'm using to determine the best keywords is HitTail. I'll provide more details in a followup post detailing some of the tools and sites I'm using the manage this blog and the main ProductCritic site.