[girzel]

I like how Amazon has a "public list" and "private list" by default, in addition to all the custom lists you can make.

Seems like the reasonable thing to do in the above case is to have a default "shopping list", and if someone puts an item into their cart and doesn't buy it within the allotted time, it gets automatically moved to the "shopping list". Make the shopping list highly visible on all the cart-related views. Problem solved?