I'd love to hear your success (or lack thereof) with retargeting.<p>Have you concluded that it delivers a positive ROI, eg are you sure those people weren't going to buy anyways?<p>My experience so far has been that it does drive sales, but that:
1. The number of clicks back to my site seems to be tiny and doesn't affect my bottom line much at all
2. Its hard to know for sure that I can attribute increase sales to retargeting (vs other campaigns)