Info : Understanding Product Classes | Ubercart 1.x

When you first install Ubercart, you will have a single node type to use when adding new products to your website called Product. The node system in Drupal is a mature system with many contributed modules interacting with it. This is true in Ubercart where you can associate assign default attributes and options to a specific product node type. For this reason, it can be beneficial for your site to have multiple node types available for adding products.

Tips: How to Replace the 'Add to Cart' button with an Image in Ubercart

Event: Drupal Ubercart training in Cologne, Germany | Acquia.com

Article : Drupal shopping carts: Ubercart and e-Commerce module still the way to go

Tutorial : Making An E-Commerce Website From Scratch With Ubercart

Presentation by Aaron Schiff

For beginners who want to start an E-commerce site.

Reference: http://drupal.org/project/ubercart

Article : 7 Reasons Why Ubercart Is The Right Choice For Drupal E-Commerce

Article : Diving into Drupal E-Commerce: An Ubercart vs. E-commerce Comparison

Info : Selling Site Access (Role Assignments)

Tutorial : Installing Drupal (for Ubercart beta & Drupal 5.x)