Just a tag line, bragging, or an excuse?

Mitch Wagner over at InfoWeek had an interesting editorial about people who include "Sent from my {mobile phone or iPhone or Blackberry}" in their e-mail messages. I know of a few people who do this because they want to offer an appology for short (blunt?) replies. I also know of a couple people who do this because it was the default when they got their phone (nice marketing, Blackberry).

In the editorial, Mitch quotes liberally from a Slate story that suggests the 'Sent from my Blackberry' tag line either acts as "...a subtle signal to my correspondents that I'm getting a lot done" or "...gives the impression that you're on the move but still chained to work". The Slate author (Paul Boutin) seems to have a double standard, suggesting that when these tag lines mention an iPhone instead of a blackberry they "...conjure an image of a doofus who wants you to know he has an iPhone".

Mitch then goes on to raise a more interesting point, suggesting that regardless of the type of phone involved these tag lines are "...symptomatic of a workplace culture that places more emphasis on effort than results."

Ouch. But maybe he is on to something...