Sony has whacked its PlayStation 3 User's Guide onto the Internet, giving you the chance to explore the console's functionality through the medium of badly worded paragraphs. (No change there, then.)
For instance, you might like to know what you can download and upload using the PS3 web-browser, or to get an overview of the PS3 Store.
You can also see how the Friends stuff works, and investigate the sorts of photo, music and video the PS3 will play back from storage devices and the console's internal hard disk. It also helps explain all the system settings, so you can see clearly what's alterable