I don't want to screw with Adsense, that's for sure. I doubt anyone could earn me half as much... Adbrite concerns me greatly as they serve Adsense units within their own advertising. Bidvertiser units are formatted nearly identically to Adsense units. I am aware you can change the colours, but I don't want to risk a grumpy reviewer. If no one has a list... well, there's a free suggestion to blog about on your webmaster websites
You cannot have ads of another contextual ad network alongwith Google ads. Examples = Adbrite Bidvertiser Clicksor etc
I figured you couldn't use Adbrite, but a lot of people seem to be doing it anyway. To their own peril, I suppose.