The Tigers shipped Mike Maroth to the St. Louis Cardinals today, according to Fox Sports.
Ken Rosenthal has the story, but it hasn't fully developed yet. More to come...
UPDATE: The St. Louis Post Dispatch has news on who the Tigers got in return for Maroth:
UPDATE: The Detroit News states that Tigers players have confirmed this trade involving Maroth.
UPDATE: The Cards' main site has this to say about what the Tigers will be getting in return:
The Tigers will scout a number of players in the Cardinals farm system from a list the teams have agreed upon. They'll then have their choice of player later in the year.