The greatest list building strategy to date that I use that has bought me thousands of subscribers has to be the $7 Script. Now for those of you that do not know how this works let me break it down for you. First of you need some sort of product, now with this product you are going to give this away (Or sell for a very low price). Now with the product you will offer 100% Instant commission to your affiliates/buyers those who have purchased this it gets them very interested in promoting your product due to that exact benefit. Now the actual script itself is great, to sign up your affiliates have to enter in the paypal email address, now another great feature of the script is they get instant commission no waiting for cheques or payments etc. The actual product will become viral as who then purchase off your affiliates then starts top promote themselves and so on, all due to the 100% instant commission. Now this builds your list because ever single sale that is made still has to go through your squeeze/landing page. It really is the best of both worlds your promoters get instant commission and you have your list being built virally. I reccomend checking it out The $7 script.