This story was approved by MLB Rumors.
According to Ken Rosenthal, the Cardinals offered Ryan Ludwick, Skip Schumaker, and Mitchell Boggs to the Rockies for Matt Holliday. I can't see why the Rockies wouldn't take this deal. Not only do they get an outfielder who could hit 30 home runs, but they get two solid players who could start with the Rockies. Holliday, who hit 25 home runs, would likely see his numbers drop somewhat playing in St. Louis. At the same time though, they could go up batting behind Albert Pujols. This deal will probably help both teams, but the Rockies would definitely have the edge initially.
The Rockies will probably counter, but a deal will probably happen within the next week or so.