Is Microsoft's Cashback putting pressure on Google Checkout?

BetaNews | at | by Mike

Although Google might not have much to fear from Microsoft, on the whole, could a new promotion in Google Checkout represent a response to Microsoft's Live Search Cashback feature? In a new back-to-school promotion, Google is now offering a $5 to $10 discount on purchases made at partner sites that use its Checkout Service.

Unlike previous promotions from Google of this kind, the current one lets you use the discount as many times -- and on as many partner sites -- as you'd like. Meanwhile, on the merchant side, Google allows participating sites to process orders and charge customers' credit and debit cards without fees.