Over in Pathfinder there is this ability
Benefit: A rogue with this talent gains a +4 circumstance bonus on all Sleight of Hand checks made to conceal a weapon. Furthermore, if she makes a Sneak Attack during the surprise round using a concealed weapon that her opponent didn’t know about, she does not have to roll Sneak Attack damage, and the Sneak Attack deals maximum damage. A rogue can only use the underhanded talent a number of times per day equal to her Charisma modifier (minimum 0).
Is there an equivalent ability in 3.5?