Just searched for a few of our products and the urls all point to something along the lines of :http://www.google.co.uk/product%5Furl?q=http%3A//base.google.com/base/a/6136004/D979653861344000755... instead of the retailers product page?

Im adding both these properties:

entry.AlternateUri = new AtomUri(ConfigurationManager.AppSettings["siteurl"] + "toycar.aspx")
entry.Links.Add(new AtomLink(ConfigurationManager.AppSettings["siteurl"] + "toycar.aspx"));

using the google .net api.