I realize this is probably very easy and I've just been staring too long and I'm simply missing it. What I would like to do is increase the width of the post content box. Both for the width and to decrease the amount of dead space between posts and the right widget.
http://www.travelingapron.com/blog/
Here is my original blog to give an example of what i mean:
http://technicalgluttony.wordpress.com/
In this example my post content box extends almost completely to the right side widget column.
I've been staring at WP editor for hours and have gone through what i thought was every single option tab and it still eludes me.
Thanks in advance for your help.