I've had a Apple Powerbook for about three years. Total Dell guy prior. Yes, they are a little more expensive but the latest versions allow you to run all your IBM software.
It works as advertised, and meshes with all other Apple products flawlessly. If you are a commuter dude hang on as Apple is bringing out a new very lightweight laptop shortly. It also has tons of embedded software. iPhoto for instance can download pictures from damn near anything without additional software.
They last a long time, run great, and work very well! Much more reliable than the Dells and Gateway I've owned prior.
Next desktop will be an Apple as well.