How Does Google Suggest Work?

You have undoubtedly heard and tried out Google Suggest, but the question to us web geeks is how does it work and how does it work so well? You've probably already seen something like that with the auto-complete of people's email in Gmail, but the size of your address book pales in comparison with every word in every language of the world. Well if you're interested, someone on Slashdot broke down the basics of Google Suggest.