Looks like Windows Live Product Upload has silently launched into beta, shame you need to pre-register to access the beta though, check it out: http://productupload.live.com/

Windows Live Product Upload Beta is a free service that helps Internet-based sellers add catalogs (A complete Product Upload Beta catalog consists of a group of online settings and an uploaded file containing offers that the seller is interested in publishing on Windows Live Product Search. The catalog settings can be created online before the catalog file is uploaded.) of their products to the Windows Live Product Search index, so that online users can view and purchase them.

Product Upload Beta also helps you manage your published catalogs and update them with the latest information. Catalogs can include product images, descriptions, prices, and links to web addresses, as well as other information to provide consumers with all the relevant information about your products.

For large business sellers, Product Upload Beta includes FTP (File Transfer Protocol. A fast, high bandwidth method of communicating between two computers.) bulk upload functionality, helping you upload large product catalogs quickly and efficiently.