From the San Francisco Chronicle:

Great day for Meyer: Dan Meyer, who was part of the Tim Hudson trade, is returning from an unusual injury. He'd been bothered by shoulder problems the past two seasons, but after seeing three different doctors and with no structural problems evident on several MRI exams and X-rays, he finally had exploratory surgery in New York last year and Mets doctor David Altchek removed a quarter-sized bone chip from the shoulder. Bone chips are common in the elbow, but rare in the shoulder.
"When I first got out of surgery, they asked me if I'd ever been hit by a car, because that's what it would usually take,'' Meyer said.
On Monday, Meyer's bullpen session went so well, he kept asking to throw more, staying out in the drizzle after the rest of the pitchers had gone inside.
"It was raining, and I was having fun,'' Meyer said. "It's been awhile since I've felt like that.''
He wowed John Baker, who had caught the lefty numerous times at Triple-A Sacramento but had never seen him like he was Monday.
"His mechanics had really changed because of that injury,'' Baker said. "Now he throws like I think he did with Atlanta, and it's so different. It's so drastic, even the ball spins differently. It comes out of his hand differently. ... He looks like a new person.''

That obviously sounds promising, any chance he regains the form that made him such an outstanding prospect?  If he can have a good month or two in Sacramento, I doubt Joe Kennedy will do enough to keep him out of the rotation.