Another Update: Wording for Sneak Attack & the Rogue class fixed to read as follows: "Sneak Attack cannot be applied to attacks made as Free Actions or Reactions."
This replaces the previous wording that said "...Little Actions, Swift Actions, Free Actions, or Reactions."
-Also, the "Opportunist" Rogue Special Ability and "Sneak Attack of Opportunity" Feat have been updated to clarify they grant Sneak Attack use when making attacks as Reactions(AOO).