How does cell phone use in public affect you?

There's a great article in Wired News about the way cell phone use has changed our behaviour in public (driving not included). Excerpts:

" Whereas once the voices in public places were always directed to people who were present, a great back-turning [has] taken place. A voice on a bus is now as likely to be speaking to someone invisible and absent as someone else sitting on the bus.

Have you noticed that no one makes firm appointments anymore? Everything is sketchy, provisional, penciled in. "I'll call you when I get there." "Something's come up; can we reschedule?"

The hell [sic] phone may be a boon to the spontaneous, but it's also a license for the slippery, the evasive and the passive aggressive to mess with your head."