A few of my most favorites are:-
Listing Form & Template - Once the template is created, new listings only require info specific to that item.
Scrolling Gallery - Has individual listings scrolling across the top of my listings to show all the varied items we sell.
Image Hosting - After I edit photos in Picassa, I upload to Vendio in just a few clicks. No fuss, no muss!!
Watermarking - Each photo has my info placed where I choose.
Customer List - Can be sorted in many ways. I like sorting by category so I can target certain customers for sales and notices.
Vendio Store - Free with subscription. With just a few clicks new listings can be added to the Vendio store too.
Submits listings to the Search Engines
Customer Support - Several ways to contact them and they reply immediately or will call back shortly. They are fantastic.
and for those who need it Product Sourcing where you can search by country.