The risks and reward are exaggerated over a lot of other types of trading. If you're going to play earnings, do 100 shares until you're really comfortable...which could take a while.
OK. Not sure if Yahoo uses Zacks for estimates...it says somewhere. Just found it...thompson (first call) supplies estimates (look at fine print at bottom of a yahoo quote page). zacks will vary on estimates due to the fact they use a different pool of analyst....both use the majors then there's a diffence in the minor analyst included.