68208 Wish List feature

I have a website based on Zen Cart, which is very similar to OSCommerce. I am looking to modify the site to incorporate a 'Wish List' feature. The best example of this is Amazon, where you can add items on the site to your 'Wish List', which will be displayed when you return to the site. This encourages customers to make a future purchase. More future work guarenteed for successful bidder.