If you are searching for an alternative to Adsense (telling the truth there isn’t any ad networks which works as good as Adsense) - what i found is
1. Adbrite
2. Bidvertiser
There two works some what better and fast. In other sites to get ads for your website will take weeks or months. I have tried Both of these ad networks and they works some what better. These two provides international support also. the minimum payout level is 10 to paypal. These two approves the sites very fast on the same day or even instantly.