I highly recommend that you bring a laptop to class. While you can potentially look over somebody's shoulder, you're not going to learn as much as if you have your own laptop. I don't want to say it's absolutely required that you bring your own, but it pretty much is.
Please pre-install the Arduino software on your machine. We'll be using the current version, 0021:
It's 75MB, so if you wait until class to download and install, you'll just be wasting a lot of your time and the class's time.
We'll cover getting the drivers installed in class, but please, please, please take the time to pre-download the main software package before arriving.