Anthony Cole

By default, the widget generates an unordered list of permanent links to blog posts with the post title. The product listing ul has a class of <code>wpec-history</code>.
Coming in future versions is the following…
<ul>
<li>Support for post thumbnails</li>
<li>Support for logged out users</li>
<li>Dashboard for tracking what products your users have looked at.</li>
<li>Hooks and Filters (dependent on user feedback. I can’t really see a need for them right now as the plugin is quite simplistic).</li>
<li>Default styling.</li>
</ul>

WP-Ecommerce History

WP-Ecommerce History is a plugin for the popular WP-Ecommerce plugin that allows users to view the products they have looked at in a sidebar widget.

PerfectSolution

New official plugin for Unzer v10+ 
With WP eCommerce Unzer, you are able to integrate your Unzer gateway with your WP eCommerce webshop. With a wide list of API features including secure capturing, refunding and cancelling payments directly from your WP eCommerce order overview.

Integrate Unzer Direct payment gateway with wp eCommerce

Integrates your Unzer payment gateway into your WP eCommerce webshop.

WP-Ecommerce History vs Integrate Unzer Direct payment gateway with wp eCommerce