Kobayashi - 7:10 pm on Oct 6, 2012 (gmt 0)
For me I have a general interest directory with about a dozen well defined and very different categories. So I created custom channels for each one so that I could refer people who inquired about wanting to advertise within a category at my site to AdWords to do so. Since the vast majority of the custom channels don't show up as managed placements in AdWords they can't be targeted so this did not work.
RhinoFish, while I agree an advertiser's ad can still show up on one of the custom channels due to an auto placement, if the custom channel does not show up in the managed placements they can't "keep" it so to speak right?