Edit: It's also really awesome for reading/editing documents, since you can fit the full page onscreen.
Have to disagree here.
For Java and iOS development widescreen is far better because it allows project tree on the left, code in the middle and outline/inspector on the right.
the industry then went for 16:10 the so called "WIDESCREEN" at that time, and now 16:9
Which is the reason the movie business invented wide-screen: To make their movies darn near unwatchable on standard television. HDTV went wide-screen to chase the movie business, which has in response pursued ever more extreme ultra-wide ratios (12:5 or 2.40 in not-insane notation) for their blockbusters, so even with a brand new wide-screen HDTV, you get letter-boxing and only partial vertical resolution when you watch the latest Batman movie or whatever.
Now there are some small movements in the direction of ultra-ultra wide-screen in the computer business, and it doesn't bode well. [1]
So it's Hollywood's fault that your computer screen has a stupid shape, just as its Hollywood's fault that it has a stupid interface (HDMI/HDCP), too.
[1] http://www.cnet.com/laptops/toshiba-satellite-u845w-s410/450...