One of the many features and benefits that are included with a premium membership is having the ability to setup your own personal categories.
During the ad placing process, you select the regular USFreeads categories where you'd like your ad to run as normal, but you also have the option of placing your ad into one of your personal categories, or create a new category to place it in.
Your ads automatically display a list of your personal categories which will also show the number of ads in each category, so anyone viewing any of your ads can quickly jump to your own categorized list of ads and see what other kinds of items you're offering without having to search through thousands of other ads.
For more information including screen shots and examples, please login to your account and click the "Personal Categories" tab.
1.) Product Catalogs