Ain't technology grand? Many cool ways to communicate that didn't exist even 15 years ago. More being invented almost daily.
I view more communications options as a good thing. Sometimes you want to be out of communications, but that's what the "off" (aka, "my battery died") button is for.
I appreciate that I have a wide diversity of friends and that I have a wide diversity of ways to keep in touch. I think that one of my fave text messages is "can you skype now?"
As for people who insist on making their phone call public by talking loudly in stores, well, I've taken to walking up to them and loudly talking back. I'm about 80% in getting the person to leave the store - so far, no harassment charges have been filed. Oh yeah, if you pull out your cell phone and talk loudly into it while following the original rude person, bystanders will laugh their asses off.