Want to get the most bang for my ads. Which is better? Google, Yahoo, Miva, or any other place? - Bob
Depends on a lot of factors including the niche. Try split testing a few networks and see what works best for you.
Like the others have previously mentioned its a matter of trial and error really of which one is going to work best for you becuase some are better for certain niches. I'm going to be launching my very own advertising network on the 1st july which you should look out for i'll be posting a little more info on the forum as the launch date starts to get nearer