Ubercart

Creating an e-commerce site
http://veg-buildlog.blogspot.co.uk/2013/11/drupal-7-ubercart-tutorial-6-of-10.html

Creating products and configuring the default catalogue view
http://veg-buildlog.blogspot.co.uk/2012/10/ubercart-7-of-10-catalog.html

Overriding the defualt catalogue module and creating product attributes
http://veg-buildlog.blogspot.co.uk/2013/10/drupal-7-ubercart-tutorial-8-of-10.html

Creating product kits, store stock control, and different order states
http://veg-buildlog.blogspot.co.uk/2013/10/drupal-7-ubercart-tutorial-9-or-10.html

Launching your site with a simple payment method, Ubercart reports, a Drupal theme, and add-on modules
http://veg-buildlog.blogspot.co.uk/2013/10/drupal-7-ubercart-tutorial-9-or-10.html

Tutorial 1 of 10: updating your Drupal site
http://veg-buildlog.blogspot.co.uk/2013/11/1-how-to-update-drupal-7-modules-and.html

Postage (shipping): why this is difficult
http://veg-buildlog.blogspot.co.uk/2013/06/why-e-commerce-software-can-be-annoying.html

http://veg-buildlog.blogspot.co.uk/2011/10/world-in-three-parts.html

Shipping modules now exist - possibly
http://veg-buildlog.blogspot.co.uk/2012/08/shipping-modules-now-exist.html