With today's release we had two large changes you should know about:
New Product and Category Assignment
With today's release, we have a new method of assigning products to categories. You will see in Admin, in the Catalog folder, a link for Catalog Organization. In this new area, you can assign products to categories, assign categories to other categories, view all the products in a category as well as view all the categories a particular product is in. Check out this Knowledge Base article for full details.