It seems like every day someone asks something along the lines of "Can I use AdSense with (fill in the blank)". Is there a "magic" list where this information is readily available?
Unless you're pushing CPM, why would you want another ad network on the same page? I take it you mean PPC? Just use affiliate programs with Adsense. There's a million and one prorgams available on the market and they all pay better than Adsense. If you have to mix two contextual programs then I would opt for Adsense and Kontera.
AdSense for content and AdBrite inlines... a winning combination that'll increase your earnings by maybe 50%.