Google Product Feed @ Web 2 Market, Inc.

This plugin replaces the Google Product feed built into AbleCommerce. It provides full support for the new requirements (as of September 22, 2011), automation and more flexibility than what was built into AbleCommerce. It also includes support for the Adwords fields, added in July of 2012. Features include:

Selectable Description field - Choose Standard Description, Summary or the combination of Name & Manufacturer
Selectable Brand field - Choose None,Manufacturer,Vendor or Store Name if the product doesn't have a manufacturer
Selectable MPN field - Choose Manufacturer Part Number or SKU
Selectable Product Type field - Choose None, Summary, the bread crumb trail or manually enter your own
Selectable UPC field - Choose None, SKU, MPN, use a product template field you create called UPC
Selectable ISBN field - Choose None, SKU, MPN, use a product template field you create called ISBN
Selectable GTIN field - Choose None, SKU, MPN, use a product template field you create called GTIN or ISBN or UPC
Default Google Product Category - Enter a default value for products not having their own
In Stock - Choose availability based on product disable purchase, product inventory or product inventory and allow backorder
Google Product Category for Each Product - Enter the category on a product-by-product basis, if needed
If a product has variants and the sku, price and weight are set in the variants, it picks up those from the first variant
Ability to add an affiliate tracking code to the feed links, for example Able's afid=1
Automatic feed generation - Schedule your feed to run daily or even multiple times daily
Specify the file name to be created
Supports FTP uploads to Google (although we don't recommend it)
Manual file creation at the click of a button
Uses the Product Feed Exclusion checkbox in the product admin, but this can be optionally ignored
Can be used to submit to TheFind
Google Adwords Integration Support
Includes one year of free updates

Licensing: One license per store. Details here.

Estimated install time: 1-2 hours.

Documentation Provided: Yes.