Not sure why so many are up in arms about this trade. I'll admit that Kremer is no world beater, but he is a somewhat competent arm that can give the team some innings from a starter it can't get right now. Take out the 2 blowout appearances and his numbers aren't terrible.
Reyes, while putting up decent numbers in Low A (and the DSL before that), is really nothing more than a long shot lottery ticket at this point in time. Maybe he makes a name for himself in professional baseball and maybe he doesn't. There's just no way to know right now. It's not like he was knocking on the door and we just gave up on him.