Thats not all.There is much more...
7) Significantly improved boot speed
8) The Powerpack edition contains a set of additional commercial desktop applications, and Fluendo licensed audio and video codecs which will automatically install when needed. Advanced digital photo retouching with LightZone, virtualization with VMware, Google desktop applications and more are included.
9) New and attractive Installer. Much easier to install.
10) Easy synchronization with Windows (TM) Mobile 2003 (and earlier) mobile devices, in addition to the existing support for Windows (TM) Mobile 5 (and later), Blackberry and Nokia devices. Also, exclusive support for direct synchronization between Windows (TM) Mobile and Blackberry devices.
11) Mandriva Linux 2009 has good support for most netbook systems (like the Asus Eee PC), including the LXDE lightweight desktop, and customization of the Mandriva tools to fit into the smaller screens
12) 2000+ Official mandriva packages.
Extracted from official mail that I received from Mandriva.