Definitely. An even more likely scenario for someone as fritter-headed as I can be is that I'll leave it at a coffee shop or hotel, no outside malice required!

Definitely. An even more likely scenario for someone as fritter-headed as I can be is that I'll leave it at a coffee shop or hotel, no outside malice required! Definitely a big concern for mobile devices, and I've been thinking lately about how crucial this makes my MBP. It's definitely not as safe as the system at my house. What I used to do is have everything on my home system, then connect to it through VNC or NX from the road. It's great when there's a fast connection available, but too frequently VNC is unusable due to unreliable internet connections. I'll get this network thing figured out some day.