A famous movie character may have said "print is dead" back in the 1980s, but it is even more true today with the growth of online media. It's taken time for people to slowly let go of traditional media to embrace digital. Certain features have finally made online media truly more appealing than print:
It's More Engaging
Print is static and even with stunning color photos, it can be quite flat. When you can start to produce content that has active video and sound, then you really start to grab your reader's attention.
New formats have even led to animated "flipping" action, so you feel like you're turning pages, just as you would with a paper document. Jake Savin (jakesavin.com) offers a little more detail on this new content format.