I've just come across
pubbrain.org. It looks like a fantastic tool for
cognitive neuroscience.
Search for a term (e.g. "working memory") and find out how many PubMed
papers have referred to different brain regions (a "heat map" is provided),
together with a list of citations. For example, Pubmed find 161 papers
linking "working memory" and "inferior frontal gyrus". Of course this
is
only the first step in understanding the brain basis of a given function,
but I think it should be very useful for gaining a quick overview.
Tom