The Ticket is reporting the deal now. I'll update with a documented source when it's confirmed.
The deal appears to involve Casey Kotchman and Stephen Marek. Kotchman is having a down year, but I'm pretty happy that one of the potentially good long term bats is out of Anaheim. Marek was ranked by Baseball America as LA's #6 prospect in the spring, though he's moved to the bullpen this season in AA, to mediocre results.
UPDATE: ESPN's updated story on the deal