How The Sample drives thousands of newsletter subscriptions

Last month The Sample hit a big milestone: we've generated over 10,000 new subscriptions for other newsletters via our "subscribe in 1 click" links (with about 600 more each week). Since the product is evidently working to some degree, I thought this would be a good time to write a post explaining what we're doing, how we're doing it, how well it's working, and our future plans.

This is a companion discussion topic for the original entry at