Just a reminder that you're not paranoid if they really are out to get you.
Many a business has given away its trade secrets, strategic plans, and sensitive numbers by not understanding the reality of industrial espionage.
And they're not just huge corporations. This can happen to small local businesses as well.
Business professional risk book or general introduction to computer security to remind yourself of the dangers of e-mail, wireless devices, and using the internet.
Plus, some links to some really great books (getting past the typically strange subject headings)