I was bored, so I made a very simple UserScript to throw bitcoin monitor into full screen.
If you care to try it, I've thrown it up at my google page.
http://j.mp/altpluzf4404
I was just playing with Bitcoin Monitor via Chrome's document inspector, deleting out width constraints, etc to make it display it 2500px wide.
Would be nice if there was an easier way to stretch it in the browser window.