1. An article of manufacture comprising: a program storage medium readable by a computer, where the medium tangibly embodies one or more programs of instructions executable by a computer to perform a method of data classification, the one or more programs of instructions comprising: instructions for receiving at least one labeled seed document; instructions for receiving unlabeled documents; instructions for receiving at least one predetermined cost factor; instructions for training a transductive classifier using the at least one predetermined cost factor, the at least one seed document, and the unlabeled documents; instructions for classifying the unlabeled documents having a confidence level above a predefined threshold into a plurality of categories using the classifier; instructions for reclassifying at least some of the categorized documents previously categorized by a different classifier into the categories using the classifier; and instructions for outputting identifiers of the categorized documents to at least one of a user, another system, and another process.