GPS - yeah that would come in handy, although when we use my wife's when we're in Dallas, I cuss that thing out with everything I have because quite often it gets me lost or going in circles...
Photos - not for quality photos, but for reference photos.. "I need a 1980 fuel pump gasket for my TR7 and this is what it looks like" kind of thing..
Rolodex - just to have everyone' contact info in one place.. I use facebook for that now..
That's pretty much it.. I'm sure there are other things, but that's all I can think of that would be beneficial to me on an ongoing basis..
Why I wouldn't buy one? Well, we've discussed that from not wanting to be the moron texting for 2 hours straight during a $150 dinner to not wanting to pay a monthly bill.. nor am I worried about losing it, dropping it, dropping it in the toilet, getting it stolen, getting it hacked, forgetting to charge it, getting busted with compromising material on it and on and on and on...
Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..