You can create pinboards about anything. Several templates are pre-loaded with titles such as "books to read", "for the home", "my style pinboard" etc, but can delete or edit these, as well as create your own category.
The site is very easy to use, just drag the "pin it" widget into your browser toolbar. When you come across something you like, click on the widget. A new window pops up- you can select exactly what you want to pin, and to which category.
Next add a description and tags. The site will automatically add the source, no need to keep track yourself!
Pinterest is also linked to facebook and twitter. You can "follow" other users, and "repin" items you like to your own pinboards.
To create an account, you have to sign up for the waitlist but I found it was very quick. Once you are signed in, you can invite up to five friends to join as well.
To see more, follow my pinboards here