Fine tuning display options

Hey everyone,

I was wondering if someone could point me to where you can fine-tune
display options - specifically where you can configure the amount of
whitespace around the plot. I am using basemap and when I run
savefig(), I want the resulting plot to take up the whole image
instead of leaving 100 or so pixels of white around it, presumably
where the x and y axis labels and tickmarks would go. Perhaps these
are simply rc kwargs but I can't find a comprehensive list of those
and the various subplot and figure options don't seem to work.