Scientific Linux 6.3

"USB 3.0 support: Red Hat Enterprise Linux 6.3 includes full USB 3.0 support."

"Added ability to switch between two graphics cards: The CONFIG_VGA_SWITCHEROO configuration option is now enabled by default to allow switching between two graphics cards."

"Support for central management of SSH keys: Previously, it was not possible to centrally manage host and user SSH public keys. Red Hat Enterprise Linux 6.3 includes SSH public key management for Identity Management servers as a Technology Preview. OpenSSH on Identity Management clients is automatically configured to use public keys which are stored on the Identity Management server. SSH host and user identities can now be managed centrally in Identity Management."

"SELinux user mapping: Red Hat Enterprise Linux 6.3 introduces the ability to control the SELinux context of a user on a remote system..."

"Multiple required methods of authentication for sshd: SSH can now be set up to require multiple ways of authentication..."

"KVM support for new Intel and AMD processors..."

"KVM “Steal Time” support: Steal time is the time that a virtual CPU waits for a real CPU while the hypervisor is servicing another virtual processor. KVM virtual machines can now calculate and report steal time, visible through tools like top and vmstat, which provides a guest with accurate CPU utilization data..."

"Improved access to qcow2 disk images: KVM in Red Hat Enterprise Linux 6.3 improved the access to qcow2 disk images..."

"Performance monitoring in KVM guests..."

"Support for in-guest S4/S3 states: KVM's power management features have been extended to include native support for S4 (suspend to disk) and S3 (suspend to RAM) states within the virtual machine, speeding up guest restoration from one of these low power states..."

"SPICE / USB 2.0 redirection support..."