Target: one creature
Attack: Dexterity vs. AC
Hit: "3[W] + Dexterity modifier damage, and you slide the target 1 square."
Effect: "Until the end of the encounter, each time you hit the target you slide it 1 square."[PH:119]
It is rated as a good choice, as it significant damage in addition to allowing the rogue to improve the control over a given target.[Charop rogue]