There have been thirty-one pitchers in baseball history to appear in 20+ games without moving their career record off 0-0. Overall, 1,417 pitchers have appeared in at least one game without a career decision.
UPDATE (2/11/13): There are now 35 pitchers who have appeared in 20+ games without a decision. The table below has been updated through 2012. The active contenders (pitched in majors or minors in 2012) are bolded:
|Eulogio de la Cruz||27||32.0||RHP|
I wonder if Erik Plantenburg knows he set a major league record during his career? Speaking of Erik's, it's kind of weird that both the LHP and RHP records for career decisionless games were set by guys with the first name Erik. There have only been nine major league players (seven pitchers) named Erik, so that's almost unbelievable.