Believe it or not, I'm a bit clumsy with technology. It's probably why I'm so excited about the touchscreen - even an idiot can use it!
I think the major good idea in Unix was its clean and simple interface: open, close, read, and write.
Things that are ultimately complex must have a simple end user experience if they are to be successful.
Twitter is all about user experience - the fact that it is so easy, so clean, so unencumbered has won it so many users and fans, for so many different reasons.
Dropbox looks really simple to the end user and is extremely magical and just works. But under the hood, the complexity of the technology is huge. The amount of work it requires to store, scale and move this data is pretty intense.
You might not think of something like TurboTax as a civic venture, but that product took a confusing interface to a government process and made it simpler and easier to use for citizens.
It's also a more personal medium. It seems to go directly to one's brain. There are no pictures to distract.