I am in charge of an affiliate program for an interesting, non-gaming product. In order to find new potential affiliates, I have been checking out product-related websites and have built an email list containing app. 25.000 domains and email addresses. Obviously, none of those are subscribers (yet). I have been using Sendblaster for mass-emailing before, but for this project I think it might be better to use a service like Aweber.
I'd like to hear suggestions about alternatives - if you have used a specific service, a brief summary of your experience would be appreciated!