Nautilus has a few shortcuts that you can type into the location bar. The most common ones are burn:/// and fonts:///. But did you know that there are a few more?
This will open the Computer view. It is basically like the default My Computer screen in Windows. You will see various devices connected to your computer, like your optical drives, floppy drives, and a shurtcut to your root filesystem. You will also find a Network icon (which takes you to network:///, see below), and any other mounted filesystems that you have access to, like a Windows partition.
This nice little window used to pop up all the time on an older version of Gnome that I onced used (2.0 maybe). Here you get shortcuts to applications:///, preferences:///, server-settings:///, and system-settings:///
This location gives you a windowed view of your Gnome Applications menu. You can drag items into the window and create new launchers in your menu. Unfortunately they do not show up right away.
This is a windowed view of the Preferences menu in the Application menu. In here you can change some of the options in Gnome.
Here you can access some tools to help you configure your computer as a server. I do not have any options in this location but I assume that they are not finished yet and would include a tool for setting up various servers (www, dns, dhcp, etc).
This is a work in progress according to the warnings I get when opening up tools in this location. Here you can manage your boot options, your networking settings, start-up services, Time and Date, and Users and Groups.
This location will show you any NFS or SMB shares that you have created. You can add new shares from the File menu. You can also connect to FTP servers throught the File menu, but it places icons on your desktop and not in the network:/// location. I also could not figure out how to access a FTP server that requires a password.
Font installation used to be a pain on Linux, with Gnome, you can open the Fonts location and drag fonts into it to install them.
This location opens up a very basic, data file only CD-Burner. Drag files into the window and right click and choose Write to CD. No audio burning capabilities yet, which is something that I think is sorely missing in the Gnome desktop.
This ocation shows you the contents of your Trash Bin.
I really like this one. Opening the Themes location shows you thumbnails of all of the installed themes on your system. You can drag and drop archives into the location to install new themes.