The Inline Entity Form module provides a widget for reference fields that allows inline management (add / edit / delete) of referenced entities. It provides an excellent solution to the product display -> product UI problems, allowing the products (called "variations" in the UI) to be managed from the product display add / edit page.
The module also provides a more modern line item management widget, that allows store owners to edit custom fields that are attached to those line items.
The official URL for this screencast is http://commerceguys.com/blog/commerce-module-tuesday-inline-entity-form, and that's the best place to comment.
The Commerce Card on File module provides an API and a user interface for storing and reusing credit card data on subsequent orders within Drupal Commerce. The module does not retain full card numbers locally but instead stores the remote ID of the full card data from the payment gateway used to validate and process your credit card transactions.
Commerce extra panes allows you to expose nodes in the checkout phase. This way you can display important information inside the checkout panes in a given checkout page but it also provides a Terms of Service submodule to expose a checkbox below the node content in order to force the customer to accept the terms and conditions of the purchase before proceeding.
The official URL for this screencast is http://commerceguys.com/blog/commerce-module-tuesday-commerce-extra-panes, and that's the best place to comment.