Luke Hochevar has two balks on the 2011 season, which is curious. Prior to this season, Hochevar only had one career balk in 65 starts, so it isn't like this has been a long-standing problem.
Of course, I don't think balks are a problem for anyone. The only guy I can even think of as "balk-prone" is Mark Buerhle... and he had five last year. Balks just aren't common.
Which makes Hochevar's two balks in 2011 both interesting and not interesting.