The newest certification available in the Unix/Linux world is that of Ubuntu Professional. The certification has been created through an alliance between Canonical, Ubuntu, and the Linux Professional Institute (LPI) and Unixreview.com have a look at it.
Read about it here
There are five major topic areas that the exam focuses upon, and they are weighted as follows:
* Routine Administration 32%
* Hardware, Installation, and Maintenance 20%
* Networking and Network Services 20%
* Gnome Desktop and Applications 20%
* Ubuntu Community 8%