I have this experiment that I played around with after last year's 30DC to learn about AWeber.
I set it up so a series of newsletters get sent out over a 12 week period then ....nothing. See the niche is a "free" one, but one I am sure can be leveraged to buying stuff (even if seasonly). I just have way too much on to do extensive testing.
So we have a blog -> signup page ->Aweber newsletters (see stats below)
Searches
What you can see here is that although the visitor numbers are low, the sign up rate is very high
Blog ststs
Sign up page stats
and that the drop out rate is also low (even though I just go silent...)
Any ideas? Mailing list, blog, signup page, SEO domain are all included