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joerginase - 3:45 pm on Nov 30, 2007 (gmt 0)
This would open up complete new markets like travel guides, restaurant guides etc. All those things you print from the web and carry with you. Lonely Planet sold out to BBC for a reason :-)
Since PDFs tend to be printed out a lot, Yahoo should try to run context sensitive IMAGE ads instead (and find a way to calculate prices for the printed copies).