Like Fedora 13, Fedora 14, the latest version of Fedora, has support for btrfs. However, it is not enabled out of the box, that is, it is not available as a File System Type option, if you did not edit the boot method to include btrfs. This post offers a very simple guide on how to pass the btrfs option to Fedora 14. Note that to enable btrfs, you will have to use the DVD installation image or the bfo image. This tutorial covers how to enable btrfs when trying to install from a DVD installation image. If using a bfo image, read how to enable btrfs on Fedora 13. It was written for Fedora 13, but is also applicable to Fedora 14.
If you are using a DVD installation image, the boot window should look exactly like the one below. Press the tab button on your keyboard to edit the options Note: This technique will not work with the Live CD installation image.
The window will change to show the options just below the boot methods. Press the space bar, then type btrfs.
The screen should now look just like this one. Press Enter to continue booting.
Btrfs will be available as an option in the File System Type menu. For a guide on how to install Fedora 14 on a btrfs file system, see Fedora 13 btrfs installation guide. It was written for Fedora 13, but still useful for Fedora 14.
Resources: Download a DVD and bfo installation image of Fedora 14 here.