This paper overviews 9 vandalism detectors that have been developed and evaluated within PAN'10. We start with a survey of 55 different kinds of features employed in the detectors. Then, the detectors' performances are evaluated in detail based on precision, recall, and the receiver operating characteristic. Finally, we set up a meta detector that combines all detectors into one, which turns out to outperform even the best performing detector. Martin Braschler and Donna Harman (Eds.): Notebook Papers of CLEF 2010 LABs and Workshops, 22-23 September, Padua, Italy. ISBN 978-88-904810-0-0. 2010.