What's one piece of technology you can't live without? #postaday2011

I've had my iTouch for two years and it quickly became a piece of technology that I "can live" without, but one that I tend to have with me all the time. I like having easy and fast access to the Internet, email, and a variety of applications. I like how I can keep up on email or the news when I am waiting for others (before meetings, etc.) or use the time to distract myself with games. Most of the time I appreciate that the iTouch doesn't ring, however it is becoming more frequent that I am would like constant access to the Internet and am thinking that an iPhone may be THE piece of technology I can't live without! The iPhone is available on Verizon now and I'm thinking about it...