I just pulled my pub id# from one of my sites. Is it the same for all my sites, or should I generate a unique "ad" for this purpose? Sorry for the n00b question, I've never shared that before.
If you're asking about the "google_ad_client" javascript variable, yes it's a unique value for your account. You must use that value on all your sites. Is something like: google_ad_client = "pub-1234567890123456"; EDIT: Also, you can specify which sites are allowed to use your pub id#.
you can generate different ad codes for different sites but yuor pub ID will be the same for all sites. its how google know whom to pay
the pub id is unique ro your account, the ad codes do change if you choose a different layout or theme