NetworkManager aims to provide a "pain free networking" experience for Linux users. Fedora 13 ships with a stabilized snapshot of NetworkManager 0.8.1 which includes extended functionality; for example DHCPv6, Bluetooth DUN and Mobile Broadband Status.
NetworkManager's upstream project maintainer since 2005, Dan Williams provided the community a very in-depth post about NetworkManager 0.8, identifying it as "the taste of a new generation", which can be consulted here.