11. A method as in claim 7 , wherein after the text islands have all been generated, for every island, dropping each text island that does not meet a pre-defined retention condition, and writing each remaining text island to a cleaned document file, the remaining text islands corresponding to the identified portions of the documents likely associated with the at least one topic of interest.
11. A method as in claim 7 , wherein after the text islands have all been generated, for every island, dropping each text island that does not meet a pre-defined retention condition, and writing each remaining text island to a cleaned document file, the remaining text islands corresponding to the identified portions of the documents likely associated with the at least one topic of interest. 12. A method as in claim 11 , wherein the pre-defined retention condition comprises a minimum number of lines for each text island.