Hey sometimes i see one sites it says 'ads by google' i really want my ad on a site how do i go about having my banner put on it? I've tried contacting them but no reply.
Its called Google adwords, you need to create an account in it but its not necessary that Google shows your site add or banner in that particular site.
Yes, those placements are part of Adwords. You would need to opt in to the Google content network to access that, though. Keep in mind these placements dont usually perform the same as search listings(especially the banners vs the text ads), and there are different best practices in terms of ad copy(users aren't actively searching for your product or service so you really need to take into account the site your placing it on when creating the ad). hope that helps, Fletch
To start using these, then read all the topics here http://adwords.google.com/support/?hl=en and then come back if you have any specific questions