The latest release of Ruby/AWS is out. It fixes a few bugs and improves remote shopping-carts by adding support for the Save For Later area of the cart.
Cart#modify now takes an extra parameter in order to support this new functionality. Cart#include? now checks both the active and the saved area of the cart before returning true or false, and there are two new methods, Cart#active? and Cart#savedforlater? for checking the two areas.
Numerous bugs were fixed, too, so all users should upgrade.