http://en.wikipedia.org/wiki/Lateralization_of_brain_function#Left_vs._right

I'm not saying wikipedia has the definitive answer, but from that it would seem there is a left/right bias for certain 'tasks'.

So this is total bullshit is it?

edit: some more info - http://en.wikipedia.org/wiki/Cerebral_hemisphere#Hemisphere_lateralization

Broad generalizations are often made in popular psychology about certain functions (e.g. logic, creativity) being lateralized, that is, located in the right or left side of the brain. These claims are often inaccurate, as most brain functions are actually distributed across both hemispheres. Most scientific evidence for asymmetry relates to low-level perceptual functions rather than the higher-level functions popularly discussed (e.g. subconscious processing of grammar, not "logical thinking" in general).

Ok, so the people saying "I'm so creative! I must be right-brained!" are talking complete bollocks. As for certain low-level (but largely fundemental) tasks, there is indeed a bias.