Click through rate comparison

Probably the click through rates on these are all pretty low.  But which of the following do you think give the best CTR.  I purposefully left out "paid ads on search results page" (such as Adwords) because they would be the obvious choice of higher CTR.  Plus they can get pretty expensive.

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In forums CTRs are very low on any kind of ad. I have voted for signatures as they are clicked often when you have something cool to say.

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It really depends on the type of website, I have some website where text links are having a high CTR. I think for all ads/links it important that those are related (thats why I voted for adsense)

I think that unless you are just trying to get click-thru's for posts on forums, that the best ads are targeted to your site and its content.  When you have a long-term following of members and visitors, it will accumulate in the long run and will prevent you from having to constantly be looking for new sources of traffic.

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