Convert hOCR to PDF
http://xplus3.net/2009/04/02/convert-hocr-to-pdf/
OCR with OCRopus and Tesseract
http://xplus3.net/2009/03/31/ocr-with-ocropus-and-tesseract/
The first one is very interesting, we should add some of the
informations to the wiki.
Best,
Christian