I wrote an article on using Flickr to promote your products over on Practical eCommerce:
Flickr, a photo sharing site, can be a powerful tool for promoting your products. Not only can you upload images of your products, where they can be seen throughout the Flickr website, but you can encourage your customers to participate and socialize with your company and products by uploading and sharing their own images of your products… – Using Flickr to Socialize Your Products – Practical eCommerce