Joe Roderick reports in the CoCoTimes that

Joe Blanton, the A's 2002 first-round draft pick, has added a changeup to his repertoire. He threw a handful of them in practice and the A's brass were impressed.

Isn't it a little weird that he didn't have one already?  How many starting pitchers are there who don't throw a changeup?

In related news, Susan Slusser mentions that Huston Street has also added a changeup to his arsenal. As a reliever, it's not so weird that he didn't have the pitch before but it can't hurt to have one more thing for hitters to worry about him throwing. How nice is it that the A's made the trades for Cruz and Calero this off-season so that they can really work in Street and Jairo Garcia at their luxury, rather than pushing them in to fill a need gap?