The Nautilus program in GNOME is not only the default file manager, it creates and manages the desktop. While it looks simple on the surface, there is a lot of hidden power under the shell. The latest version of Nautilus is 2.14.0, which is included in Fedora Core 5.
Linux box admin has a new article, which covers hidden features of Nautilus shell. This a really good list of all nifty features for all newbies out there.