Just this week, ClickBank announced their new Automated Recurring Billing feature. This allows merchants to set up products like membership sites, subscriptions and anything that bills the customer on a recurring basis.
Within the next few months, I imagine there will be A LOT of products hit the ClickBank Marketplace that follow this model. What this means for Affiliates is... recurring affiliate commissions!
You promote a product once, and get commission on that product for as long as the referral stays subscribed. This should be a great opportunity for merchants and affiliates alike