Just came across this awesome tool which will let you format webpages in real time, and then output them to a printer.
Here's the URL http://www.printwhatyoulike.com/
And here's a link to this very page opened up in the site, so you can try it out.
Brilliant. Why didn't I think of that …. Oh, and they've also got a 'bookmarklet' (great idea, terrible name) which you can drop onto your IE or Firefox toolbar which gives you quick access to the functionality of the site. Just click the button, and the page you're currently browsing will open in the Printwhatyoulike website.