I recently posted a thread on these forums about a program to save paper. I was told you try FinePrint, and now I couldn't survive without it.
It allows for double sided printing (where you simply flip the paper around to print the reverse sides). It also has the ability to print up to 16 pages on 1 single sheet. Which can be great for printing an overview, or if you have excellent eye sight

.
So far I've saved 20 pages, and FinePrint even keeps a percentage of how much paper you've saved.
http://www.fineprint.com A free trial is available for download. It's nice and small so I reccommend giving it ago.