If you have a product that can be sold high end on the front end, then I like Diego's idea of having a high ticket front end and the recurring membership as the upsell. This isn't anything new but it has done well. You can also do something recurring as a downsell.

Putting my JV prospect glasses on...I know I like that initial front end kick of the high ticket sale and assuming your conversion on the upsell is good (as well as the stick rate of members), I love the recurring portion. Personally I am a bit hesitant to do straight membership promos sometimes because many times there hasn't been enough testing on stick rate before the actual launch, so if the members aren't sticking it can be a huge bust. With the initial product front end, I will have a general idea of how my list will respond and then even if the stick rate on the recurring upsell isn't great, I at least know I will do okay from the front end. Of course that's just me.