I don't seem to have blur node, using v2.69 Following along in tutorials I see the blur filter being used. I am using Blender 2.69 and I can't locate it visually or even with a search. Actually, there is no "Filters" category at all.

Do I have to download something to get it?
The "Blur" node is only available in "compositing" node tree type. The type can be chosen at the bottom menu-bar of the Node Editor window.

The 3 little icons correspond to the 3 node tree types available :


Shader nodes (for materials)
Compositing nodes
Texture nodes