Per Joe Smith of the Heater, Jason Isringhausen has been placed on the DL and Winston Abreu has been promoted to the majors. Hate to see it come this way, but the guy has earned his shot. To recap check out this and this.
Basically, Abreu throws hard, has seemingly decent-to-good breaking stuff in his slider, is striking out the International League like nobody's business, and has a long track record of success in Triple-A without much major league time to speak of. Absolute worst case: he turns in an awful performance and we DFA him in a month. Best case: he turns into a ~3-3.5 RA reliever in a pen that could use a high leverage reliever with that type of success.
Congrats Winston, you've earned it. Now please, please stick.