The mainly-US affiliate network, DirectLeads, operates a 'co-registration' system where affiliates add a 'co-reg' box to their own newsletter/competition entry forms.
If someone completing the form on the affiiate's site ticks (or doesn't untick, depending on the arrangement) the box to also agree to subscribe to the merchant's newsletter, the affiliate earns a small commission. It can be quite profitable.
I'm looking to do something similar on the UK side of things. Anyone here run a UK-specific site where a 'tick this box to subscribe to the blah-whatever newsletter' would fit?
If so, let's talk. I'm looking to generate extra subscribers for one of my UK-specific newsletters.