PPC network for displaying ads only to previous site visitors??

Sorry for the long title for the thread... I came across an article a long time ago about a PPC network that works as follows:

- A person visits your site (cookie tracked).
- On websites associated with the PPC network (mostly news related sites) a banner ad for the website will display [constantly reminding the viewer of the website they visited - being very targeted]

Basically, banner ads only appear to previous website viewers and a PPC fee is only applied when the banner is clicked (no additional costs for the service).

I can't remember the PPC network name but I'm sure there are heaps of them out there now that do the above.

Appreciate some references from those who know.

Adwords has this feature. It's called audience retargeting.

Thanks! I'll read up on it. Any other known service providers? I'm not a huge AdWords user so might be more profitable for me going with a company who can set everything up for me, without it costing more (other than probably more for each click).

Hey did you find anything else?I am not a huge adwords user but like the concept.

many networks offer retargeting. just do a search for "ad network retargeting" etc.

also, plenty of fish will have a frequency cap you can set the number of times an ad shows per visitor. i'm sure other networks do the same thing.

you can check out adtoll also .. they got those features as well

Adbrite and ExoClick do that too..