Regarding decisive strike from PHBII:
If the attack hits, it deals double damage (as does any other attack you make before the start of your next turn).
Does this follow the rules of critical strikes where additional damage dice are not doubled (e.g. if a wizard cast sonic weapon on a bow, critical strikes won't double sonic weapon damage), or does it double all damage dealt? It seems like decisive strike does not have the exception outlined for critical hits on p.140 in the PHB, so it would appear to double everything. I am unsure, though.