ZDNet is running a blog article about the use of Windows in public-facing applications like self-service interactive kiosks. The experts they interview agree that perhaps it's not the best idea to use Microsoft's flagship product as the platform for machines that have to be exposed to the public 24/7. Here's a snip:
"Even in the case of terminals with a keyboard and pointing device or kiosks (like an Internet terminal), it probably couldn’t hurt to have a big red publicly accessible reboot button in case something goes wrong (with instructions like 'PRESS HERE IN CASE SYSTEM STOPS WORKING')."
That's certainly not the prevailing attitude in the Linux/UNIX world :)