If you have an ecommerce website, you are no doubt thinking of the upcoming Holiday Shopping Season. So if you are wondering how to reach the most shoppers during the biggest sales time of the year, you should be getting your product data feeds ready for Comparison Shopping Engines. Shopping engines, such as Google Products, Bing Shopping, Shopzilla, NexTag, and PriceGrabber, offer many tools not offered by regular search engines. Some are free, and most have their own specific requirements for data feed submissions. Conforming and optimizing these feeds can be complicated and time consuming but the benefit is substantial.