AdBrite has earned me some $186 in the past 3 months.
It is expected to earn me around $500/mo if i change all my ads to adbrite.
But i am using adsense too - don't know why.
With adsnse i have earned $2.76 yet! (Jan-Feb-Till Date)
So, i recommend Adbrite
Click here to sign up!
You may also find some useful links like to adbrite in my signature.
I hope my links help you.
Regards,
Ashwin
adbrite.com