Your wood is lacking specularity. Take a look at a real piece of processed wood, and you'll see a slight sheen to it.
If you're very ambitious, and want things to look "photo-real" without much effort, take a look into un-biased renderers. There are a bunch out there.
Maxwell (commercial $$$)
Radiance (was free)
Lux render (free and open source!)
I've used Maxwell and Lux before. Both are good, but be aware, these will take upwards of 10+ hours to render! The nice thing about Maxwell, is that there is an extensive shader library, including pretty much any type of wood, metal, etc.
Also, if you haven't already, take a look at this tutorial here: http://www.simply3dworld.com/movie_p...tml?tut_id=164
Imagination is more important than knowledge.