When i first started I had campaigns at all three, it was honestly too much to manage. I dropped down to just google and have seen good results. Now that I feel I have a handle on google I might wanta give the others a fair try. Total paid visitors: ~10,000 / day Google: 100% adCenter: 0% Yahoo SEM: 0%
Glad for your post. I had the same far from encouraging results from adCenter and then I started looking at other alternatives. Came across Dojo Hut and am now working out a campaign with them.