Jakob Nielsens "PDF: Unfit for Human Consumption" rant is being blogged heavily. Of course no one blogs the implied statement: PDF's are great for digital distribution of paper documents. This is a true and valuable revolution and people who don't recognize that are forgetting how hellish printing material retrieved from the net used to be - if you could retrieve it at all. I love PDF's for that.
For online use PDF's are terrible (just like Flash, but in contrast to that abomination PDF's weren't made for content originating online), and Jakob Nielsen's alertbox is completely to the point of course.
Furthermore we all know (from the Sklyarov case if nothing else) how detestable Adobe's position on right of use and copyright is.