A product feed is a data file that contains information about all of your products in a specific format.
GoMage Feed Pro extension allows you to provide information about products from your online store to search engines like Google Base, Yahoo! Store, eBay and other sites that collect and show information about your products.
Features
Unlimited number of feeds on your store
Ability to send your product data to all Search Engine Services you utilize
Ability to send product data from any of your Magento stores directly
Ability to send different data and prices to each of these places
Providing a permanent URL for Search Engine Services
Ability to send your product data files through FTP
Ability to automatically send your product data files using business rules
Set the Auto-generate and Auot-Upload times for Feed files (new)
Ability to set Passive mode Enable or Disable
Easy Fields Mapping with ability to use Output Type filter for every column
Import And Export Fields Mapping into the Server (new)
Advanced Product Attributes Filter Configuration
Upload Out of Stock Products in the Feed file (Option) (new)
Upload Disabled Products in the Feed file (Option) (new)
Upload Categories and Sub-Categories (new)
Upload Images (new)
Ability to remove line break symbols from a data feed
Supported formats: csv, txt, xml
Ability to use File Creation Settings for slow Servers
Ability to use Dynamic Attribute that allows you to set your own conditions for Categories, Prices and etc
Import And Export Dynamic Attributes (new)
Easy installation requires you simply upload files without the need to change code or templates.
Where you can use this extension:
Google Base (in the US, UK, Australia, Germany, France, Japan, China, Italy, the Netherlands, and Spain), Yahoo! Store, eBay, Facebook, PriceGrabber, Shopzilla, DealTime, Froogle, Kelkoo, Nextag, Shopping.com, ShopBot.ca, PriceCanada.com, TheFind.com, Commission Junction and many more...
http://www.gomage.com/extensions/advertising-marketing/gomage-feed-pro.html/