Having email, the Internet, a PDA and your cell phone all rolled up into one tiny device in your pocket that's really manageable has really helped me be more efficient, particularly traveling the world because it all works globally.

CNN: 'Tennis is dependent on jet travel'

Using a PC or laptop (or cell phone or PDA), you can peruse a calendar that shows open slots at your local dealership.

CNN: Analysis: Brace yourself for the e-scheduling revolution

The smartphone is just a merging of the cell phone to a PDA. Not that revolutionary.

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