I'm 99% sure that you can use both, as long as you can distinguish one from the other (they dont look exactly the same).
Yeah! you can use both together all you need to do is to represent both agencies with different ads format
Yes, you may do so, provided that the Adbrite ads have different ad formats and/or color schemes with the Adsense ads. This is to prevent confusion of your visitors.
Yes, you can use them both on your site. However I wouldn't recommend to do so. More ads doesn't mean more clicks and more money. And since AdSense pays better I would use only AdSense.
yes, you are allowed if you display non contextual ads only. you can use their cpm ads. and others. but as i know that you can not use their contextual ads on same page with google adsense.
Yes you can add both but remember i am sharing my view , you must be thinking if i will add both adds options than you may get more clicks if anybody slip down to the page and don't click on adsense than may be he will click on adbrite . But by this your earning will be divided and you will not be able to achieve one single target and payment get more delayed , so use only one you like .
Ya You can add both ads with no probs but adsense earning is very low compared to Adsense but Adbrite has a Inline ads ..
Yes surely you can use both Adsense and Adbrite together on the same website by the time they have different layout
u can use both...ideally use text link ads for Adsense and banner ads from adbrite....u ll get a much higher conversion rate....