Quick Sketch Effect Tutorial

Steps:

1) Duplicate layer

2) Adjustments -> Invert

3) Layer -> Blending -> Change to Color Dodge

4) Filter -> Gaussian/Motion blur

5) Merge layers

6) Adjustments -> Hue/Saturation

7) Save it :)

(According to: http://www.youtube.com/watch?v=JqbWzvoDjrY)