Remedy for company owned computers/laptops:
Run Dropbox on an account that's not accessible by users. You can set it to run at startup via Scheduled Tasks or crontab. For added security, encrypt those db files containing the authentication keys with EFS (Windows only). The Dropbox folder will then be made accessible to authorized users via filesystem permissions. Unfortunately, this won't scale well for multiple Dropboxes per computer.

One should not use Dropbox for sensitive documents anyway, because:
1. Dropbox staff can read file names
2. They can obtain the decryption key if they really wanted. (If you can reset your password, they obviously can, too.)

when there is no other widely accepted way to verify a website's identity.

When I insert a USB stick, Windows XP opens an AutoPlay window asking me what action to take. If the autorun.inf file is found, the default choice in the AutoPlay window is to run whatever is in autorun.inf. What now? Does XP completely ignore autorun.inf with this update?

What will happen if the bomb is inside the building with this wallpaper? Where would the explosion go?

Watt-hours is a common unit conjunction meaning watt times hours, which is an energy term. There is nothing wrong with it.