How smart is it to have a smart phone?

So I have a smart phone (for the curious it is an HTC S620 aka T-Mobile Dash). I have taken to using it as phone, calendar and most often as a web browser. I probably consume a good chunk of the NYT on that tiny 3 inch screen. Often sitting on BART I see fellow phone readers. They are reading e-mails. surfing the web or in the case of Iphone-ers playing games. There is a nice article in today's Times about our little "problem" and why its been a winner even is a recession.