I live and die by my outlook appointments so I use a smart phone. I have used a few different ones over the years. I'm currently using Verizons Windows Mobile PN 820.

I don't need all the features of a blackberry so this is perfect for me. It's just a phone w/ my calender, contacts and to do list. It's tiny enough to slip in my pocket like a regular cell phone but the screen is clear enough and big enough for me to navigate through appointments.

I'd be lost without it.