Fedora 16 uses Chrony as the default Network Time Protocol (NTP) client. Chrony is designed to work well even on systems with no permanent network connection (such as laptops), and is capable of much faster time synchronisation than standard ntp. Chrony has several advantages when used in systems running on virtual machines, such as a larger range for frequency correction to help correct quickly drifting clocks, and better response to rapid changes in the clock frequency. It also has a smaller memory footprint and no unnecessary process wakeups, improving power efficiency.
Fedora 16 does not ship with the HAL daemon and libhal, which have been replaced with udisks, upower and libudev. If a specific application require libhal to function, please file a bug against it to be ported to the new technology.