Thanks Todd. Out of curiosity, how big do you have to be for Rubicon Project and PubMatic, in terms of pageviews/mo?
Your other options for mixing stuff in with AdSense would be to find some fairly targeted affiliate programs; however, it's tedious and requires quite a bit of upkeep.
[1] http://www.adexchanger.com/platforms/as-ipo-dust-settles-rub...