There FAQ page answers a lot of questions.
http://www.etsywishlist.com/faqThe only real promotion you get is if you share the list with your friends. Other than that I feel like your products get just as lost on EtsyWishList as they do on Etsy. Your items should already be on there. The easiest way to find your items is to include your shop name in your item tags and then search your shop name on EtsyWishList. Everyone of my items came up.
I hope this helps!
Thanks,
Val