I'd agree with this point - "promote sustainability by saving a few trees’ worth of paper"
Was at a meeting the other morning, must have been about 60 people, each carrying the 36 page document we'd been urged to print out and bring with us (which, in the end we didn't need!)
I sent the PDF to drop box, opened it in note taker HD & so saved 18 pages of paper (double sided printing) , multiply that by all those people having all those meetings and a business does have the opportunity to save a lot of paper without compromising security.
I didn't need to connect to the corporate network and the document didn't contain any sensitive information.
As usual, common sense is required and I suspect this is where BYOD will fall down.