Does Blender have a library of prefab materials?

Support Materials and Textures
1

New to Blender.
Used to use Moray/Povray.

Does Blender have prefab materials library?
Thanks,
Xylene

2

http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Material/Online_Material_Library

3

I am also new to Blender. These two addons are very useful! I hope that they will be by default in Blender.
Thank you!