Fedora 15 released on May 24, 2011!

Fedora is a fast, stable, and powerful operating system for everyday use built by a worldwide community of friends. It's completely free to use, study, and share. Fedora 15 “Lovelock”  released in May 24 2011 after six months of the release of Fedora 14 . Fedora 15 is called Lovelock and includes the new GNOME 3 desktop environment with the GNOME Shell user interface.

Major features for Fedora 15:
1-GNOME 3 with GNOME Shell as default desktop .
2-LibreOffice replaces OpenOffice.org .
3-New filesystem – BTRFS .

4-KDE 4.6 with the improved Plasma workspace, enhanced core applications, and greater memory efficiency. 

5-XFCE 4.8 with a new panel, Thunar enhancements and more.

6- System and session management via systemd, providing more consistent configuration and improved boot performance.
7-Dynamic firewall .
8-Virtualization improvements including Spice support in virt-manager and support for Xen hosts.

Download Fedora 15
Download Link is here