Here's clever little video that shows the relative popularity of computers over time. You'll need to watch it pretty closely because it's only 28 seconds long and it covers everything from 1975 to today.
It really puts the success of the iPad into perspective. Right now there are more iPads in use than Macs. The same goes for iPhones, too.
Nate Hoffelder is the founder and editor of The Digital Reader:
"I've been into reading ebooks since forever, but I only got my first ereader in July 2007. Everything quickly spiraled out of control from there. Before I started this blog in January 2010 I covered ebooks, ebook readers, and digital publishing for about 2 years as a part of MobileRead Forums. It's a great community, and being a member is a joy. But I thought I could make something out of how I covered the news for MobileRead, so I started this blog."