We need a material reference thread

[OnyxAuger]

So, I'm looking around for some material samples.
Like metal, wood, glass, matte, gloss, lalala, blah blah, etc.
I've been having a hard time.
Does anyone have any sites they go to regularly?

[creaxjz]

http://www.creativecrash.com/maya/downloads/shaders/c/
go for 3d shaders.

[Oblivia Enna]

http://browse.deviantart.com/resources/textures/ :)