20 second boot time - from the moment you turn on the computer to the login screen; shutdown times were also reduced
Default EXT4 install - the Fedora team took quite a bold step as the installation now defaults to this powerful new filesystem; experimental Btrfs support is also available;
New artwork - beautifully designed from boot to the desktop: birds, wavy ribbons and dark blues are part of the new theme;
Plymouth - offers beautiful, next generation graphical boot animation;
KDE 4.2.2 - the latest and greatest K Desktop Environment with all its eye-candy included
GNOME 2.26.1 - though there are no major changes, users will notice Brasero as the default CD/DVD burning tool, some minor interface tweaks, improved filesharing, better Microsoft Outlook support in Evolution and more;
Xfce 4.6 - many new features make the lightweight desktop environment much more efficient and production-ready;
Automatic Fonts & Mime Installer - enables third-party programs to automatically install required fonts, codecs or clipart;
Fingerprint reading - devices that provide this feature are supported in Fedora 11 out of the box and configuring them can be easily done through the Authentication Configuration utility;
ABRT - the Automatic Bug Reporting Tool is a very easy way to report bugs;
Nouveau - the open source Nvidia driver is now enabled by default;
Presto - updating the system will be much quicker as this yum plugin brings support for deltarpms, ensuring that only changed components are downloaded, not the whole packages;
Mozilla Firefox 3.5 Beta - a plethora of enhancements to the most popular open-source browser makes this a great choice;
Thunderbird 3 Beta - a great email client with improved performance and better IMAP support;
Xserver 1.6 - bringing improved performance and stability;
MiniGW - Windows cross-compiling has never been easier;
TigerVNC - now the default VNC client;
GCC 4.4, NetBeans 6.5, Python 2.6 and Git 1.6.2 are sure to increase developing productivity;
OpenChange - out-of-the-box Microsoft Exchange access;
Improved Volume Control, now more user-friendly with per-application control and better handling of multiple speaker sets;
DeviceKit system service, providing better ways to monitor disks through the Palimpsest utility