I've got a Toshiba Portege that my employer provides to me. It's fantastic because it's so light and fairly powerful. The only complaint that I have is that a modular DVD player was not provided/ordered with the system.

For a home computer I have an Apple Powerbook 12". I love having the freedom to work, etc. from anywhere in my place. I've married it to a wireless network and now have some serious flexibility. As a matter of fact, I'm typing this right now from my balcony as I watch the sunset over western Chicago.

Portability is definitely where it's at. I would love to be able to carry a blackberry sized device to handle all of my computing needs. Hopefully we aren't too far off.