It's really quite simple - all that is included is the laptop, battery, an AC adapter, and instructions telling me to see http://www.laptopgiving.org/start for details on how to use it. So of course I installed the battery, plugged it in, and turned it on. It is about as small as I thought it would be, but heavier as well.
After about 30 minutes of fooling around I have to admit it is very hard to use. It is clearly designed for children! You don't have access to nearly any OS details/capabilities, let alone advanced ones. By the way did I mention the OS is called Sugar and is derived from Fedora Linux? At least there is a Terminal, but by default the PATHs aren't set, so to figure out your OLPC XO-1 MAC address you need to do:
You can find more photos elsewhere, like here.