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interestingly, acrobat 9 natively uses the PDF 1.7, adobe extension level 3, PDF spec.
which, incidentally, seems to be fully backwards compatible, and yet seems to yield PDFs (specifically of scanned/unOCRed text/books) that are up to 70% smaller than when encoded with acrobat 8.12
(Perhaps they've started saving black/white pictures in something more appropriate than 24-32bit colors? i don't know, all i know is that my ~4.5gb ebook collection last week became a 3.1gb one, while staying just as readable)
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