Fresh on the heels of trading Kevin Millwood, the Texas Rangers have signed Cubs castoff Rich Harden. The deal is reportedly a one-year, $7.5 million deal with a $11.5 million option (presumably a team option) for 2011, per NBC Sports.

This signing – and the speed of it – definitely lends credence to the theory that Harden would have accepted arbitration from the Cubs.

Still doesn’t excuse not trading him mid-season, of course.