Late last year, Advertise.com and the Search Engine Marketing Professional Organization (SEMPO) shared some interesting findings from a survey on ad technology, and found that remarketing (sometimes called retargeting) was considered the most under-utilized online marketing technology by nearly half or respondents. 

Update: Anytime interest-based advertising is mentioned, privacy concerns usually follow, based on its use of browser history.  A Google spokesperson tells WebProNews, "An advertiser can only remarket to users who have visited their site (or who have interacted with their YouTube homepage ad or brand channel)."

Advertise.com and the Search Engine Marketing Professional Organization (SEMPO) have shared some interesting findings from a survey about online ad technology. The two organizations found that there is a lot of untapped opportunity for retargeting in online advertising.