If you had to pick a technology, excluding software, that has caused the biggest transformation of personal productivity, what would you select?

Microsoft Office? Nope, I said not software … come on people!

Laptops? Possibly. Definitely a leading transformer for freeing us from being desk-bound, but the leading one? I think not.

OK, how about GPS? Nope, definitely huge but not the biggest. Pad- or tablet-style computers? Too soon to tell.

It would have to be the cell phone. Sorry, it is kind of prosaic, but given how much we expect to stay in touch wherever we are and how much business we do through and because of cell phones, this is perhaps the one and only truly indispensable high-tech tool.

Now, the one accessory to the cell phone that you need if you are going to make and receive calls while driving (which is definitely not recommended by me or, for that matter, by Oprah ) is a headset. And what is the coolest headset? [more ]