Steve:

Probably not the right commercial for Apple's primary customers, but I've dragged a goosed-up Macbook Pro around for a while. Use ArcGIS (9.2) via Parallels. It runs everything, and, so far, avoids the disasters while letting me do fast and easy graphics interfaces (Photoshop, Illustrator, CAD).

Working outside the US with civilians is, perhaps, the nastiest environment for bugs and viruses, but my Mac always stays above the fray. After all, who in their right mind would create a virus for Macs (Other than Dr. Evil, or Number 2)?

Plus, its so damned cute.

Steve