Jacob notes that Armando Galarraga's velocity is up this year, an anecdotal sign that he's due for an improvement in peripherals. Also in the article as improvement candidates: Barry Zito, Justin Verlander, Chad Billingsley, and Roy Oswalt.
"Galarraga is an interesting case. He had a great rookie campaign last year, going 13-7 with a 3.73 ERA, but that looked to be rather fluky, with a 4.88 FIP and .247 BABiP. He's off to a great start again this year, 3-0 with a 1.85 ERA, but this time there's actually some evidence that he may be able to keep it up, with his fastball going from 90.2 to 91.3, his slider up a tick (0.6 mph), and his FIP way down at 3.37. His ERA won't stay under two of course, but there's reason to believe the previously inevitable regression back to league average (or worse) won't ever come."