Would running Adsense and Adbrite links on the same page be against TOS? Is adbrite links considered contextual advertising?
It would depend on how you had your Adbrite ads set up. If you turn off the network ads then you'd only get ads from people who'd you'd approved. For example, you can sell 7 day text links via Adbrite. Those ads aren't contextual and would therefore be permitted with ADsense.