Red Wings get Erik Cole from Dallas for 2 prospects: Mattias Backman (22, playing in Sweden), Mattias Janmark (also 22, also playing in Sweden) and a second round pick for Cole and a third-rounder. Dallas gets their pick back if Cole plays a lot and Detroit makes it to the second round of the playoffs.
I think it's a great trade. They give up two guys who aren't even in Grand Rapids and a pick to get a power forward (even if he is a rental).
EDIT: Looks like if Detroit makes it to the conference finals Dallas gets the draft pick back, not the second round.