Ecwid currently has six widgets available:
Product Browser: the main widget, it populates shopping cart with products, product details, shopping cart details, checkout prices, search results and etc.
Minicart / Bag: displays items quantity in the shopping bag.
Horizontal Categories: displays product categories in the horizontal list with tabs
Search Box: allows to search your products
Single product: allows displaying only one or few items on web pages.
More about widgets: http://webtrends.about.com/od/widgets/a/what_is_widget.htm