Smartphones have been a key part of my life for years. It was a small conversion at the time, as I had Palm & HP handhelds before. Shifting from two small devices to one was wondrous. Geekous maximus. In the smartphone realm, my first was a Treo, then to Blackberries (when Treos finally annoyed me enough). Then I got a iPhone, followed with a brief foray into Windows (both a WinMo 6.1 & the WP7). So, I think I know how to use the devices efficiently.
Anyway, here are the basics of how I use mine. Some things I've used for years, some are only germane now with post iPhone smartphones.
This has been a simple stream-of-consciousness list. Hardly all-inclusive. Have anything you want to add? Drop a note in the comments. I'd love to hear it.