Do you have a SSH server running somewhere? Have you ever wondered why it gets hammered by brute-force password guess attacks all the time? My server got 4669 login attempts on 2013-01-12. Have you ever wondered what these guys do if they actually manage to get into your server? Have you ever wondered which passwords actually get tried, in order not to use them yourself?
This post explains how your employer might have access to all your SSL-encrypted communication, including for example the internet bank.