Is it a challenge to organize categories for thousands of products? here is the solution!
Smart Category extension dynamically change the product category according to a set of conditions (Similar Smart Playlists on iTunes). You can create categories based on rules you specify, and then update these categories automatically as your products changes.
For example, you could create a category includes only new products. Or you could create a categories of products by a particular brand, color, size, etc. You can add as many conditions to the expression as needed to describe the products to include.