Listening.

I find questioning the importance of listening to be rather ridiculous, but what's more ridiculous is how much said importance is ignored. It is one of the only two critical factors of communication, when you break it down. If you aren't listening to what's communicated, it was all in vain, no matter how affective the communicator was. Likewise, the one doing the communicating is doing everything they can to get you to listen. It's the most important part of the entire process.

Communication Technology

I'm only a student, but I've done an incredible amount of business on my cell phone. Especially compared what we were capable of only a few years or months ago. We have been able to use mobile internet for years, but it's incredible how much information we can access, how we access it, and who can access it. Not that it would be the optimal medium, but I am able to create, edit, package, upload, print, and purchase an entire book on my phone, which I have done. It's difficult to wrap one's mind around what mobile information capabilities we'll have in the future.