Google this week temporarily attached Google Checkout icons to ads from companies that haven\u2019t signed up for the online transaction system, a glitch that caused some confusion among advertisers."For a short period\u00a0[Tuesday] night, the Google Checkout icon was inadvertently assigned to ads for U.S. AdWords clients who are not Checkout users. We resolved this very quickly and do not expect it to impact ad performance," a Google spokesman wrote via e-mail on Wednesday.Merchants don\u2019t have to be Google AdWords advertisers to offer Google Checkout as a payment transaction option on their websites. However, merchants that are AdWords advertisers get a break on Google Checkout fees. Specifically, for every US$1 merchants spend on AdWords, they can process $10 in sales through Google Checkout at no charge. These merchants\u2019 ads also appear with a Google Checkout icon, to let potential shoppers know that they\u2019ll be able to complete the transaction using that Google system. This week\u2019s bug was noticed by various users and commented on in discussion boards and blogs.Reprise Media, a provider of search engine marketing services, wrote about the problem in its SearchViews blog after officials noticed on Wednesday morning an overabundance of Google Checkout shopping cart icons in AdWords ads."To see whether this truly was an explosion in the use of Checkout or just a weird glitch, we Googled ourselves, and sure enough ... the little blue cart denotes Reprise Media as a certified Google Checkout merchant, along with two other sites. We\u2019re not," the blog posting reads.Over on ThreadWatch.org, others commented on the proliferation of Google Checkout icons and wondered if it was a bug or a sign of broad adoption of the service.Google Checkout, which launched in June and is seen by many as a potentially serious challenger to eBay\u2019s PayPal, has been criticized recently by some merchants and shoppers\u00a0who feel Google sometimes takes too long to review and approve sales orders.-Juan Carlos Perez, IDG News Service (Miami Bureau)Related Link:\n\nGoogle\u2019s Checkout Payment System Due Thursday\n\neBay Bars Use of Google CheckoutCheck out our CIO News Alerts and Tech Informer pages for more updated news coverage.