Awhile back we reported that Google is really trying to push its Google Checkout payment processing service by offering a $10 coupon to everyone who signs up. They're still offering the coupon, and they've even dropped the if-you-spend-$30-or-more requirement, and today I decided to bite the bullet and grab my sweet, sweet coupon. But I was a little annoyed that Google doesn't tell you up front, before you sign up, exactly which stores are participating in the promotion. The promotion page just lists fifteen of them, and says "And many more!"

Where am I going with all this? Well, since I did bite the bullet, I thought I'd satisfy everyone's curiosity and list all of the web stores that are participating in Google Checkout's $10 coupon promotion (Google Checkout has many more stores under its umbrella, but not all of them are participating in the promo).

In case you're wondering, I found the whole Google Checkout process really streamlined and painless--much easier than PayPal, far easier than most stores' built-in checkout system. Now that I've finally signed up, I'll be using it whenever it's available.

Anyway, see the full list--234 stores by my count--after the jump!

After literally years of rumors, Google has launched its much-talked-about e-commerce payment system, Google Checkout. The idea is simple: Google holds on to your credit card and shipping information, and when you find something you want to buy at a Google Checkout affiliate, completing the transaction is a one-step process. "The goal here is to make it be one nanosecond from the time the customer decides to buy to the time the transaction is complete and the product is on the way," says Google CEO Eric Schmidt in the New York Times' coverage of the launch. Google has a trick up its sleeve for luring in merchants, too: If you're a merchant who buys advertising from Google AdSense AdWords, Google will waive some or all of your Checkout transaction fees. But for those who don't enroll in AdSense, the fees are still comparatively low: 20 cents per transaction plus two percent of the purchase price.

What do you do when you own the world's biggest auction site, VoIP network, and online payment service? Hook 'em all together, of course. Today there's a bunch of news floating around about Skype being integrated with both eBay and PayPal. First is a little screenshot from Random Good Stuff that shows two new PayPal functions in the upcoming Skype 2.5, one for sending money via Skype and one for requesting money. Not exactly mind-blowing, but for people who conduct business over Skype it could definitely come in handy. Second is eBay's announcement last night that it would be integrating Skype into its auction pages. On June 19 a pilot program in 14 of eBay's auction categories will allow sellers to place a "SkypeMe" button on their auctions. Marshall Kirkpatrick at TechCrunch has a list of all 14 categories (obvious: wired networking routers, VoIP/Internet telephony; not so obvious: beds, silver coins, Lost in Space collectibles) and some thought on the offering. Like Marshall, I'm not sure how fast this will take off, if at all.

We've heard it referred to as Google Wallet, Google Checkout, Google Payments, and now GBuy. Google has long been rumored to be working on a payments system to rival eBay-owned PayPal, and according to Forbes--which calls it GBuy--Google will be launching its online payments system on June 28. Unlike Google Payments, which was integrated into Google Base, GBuy will be intended for merchants who have their own online store, but transactions will be completed through Google's servers. Forbes quotes analyst Jordan Rohan, who says this would allow Google to "capture e-commerce transaction data, driving more precise targeting in future searches." Rohan also believes Google will mark marchants who accept payment through GBuy as "trusted GBuy merchants" when they're listed in Google search results.

There's a lot of speculation about Google going around about today (not that that's different from any other day). First, Inside Google is reporting a scoop from a "quality tipster" that Google recently sent out a notice to beta testers about a system that would allow users to make purchases from "high-quality merchants" through their Google Accounts. According to Inside Google, the notice included a laundry list of products including "cell phone and iPod accessories, music and movies, health and beauty supplies, furniture, housewares, sports and outdoor gear, toys, games and more." In possibly-related news, ZDNet's Garrett Rogers says MarkMonitor, a company in the corporate identity business and which Google has been a client of previously, has registered GoogleCheckout.net, .org, and .info (as DNStination, Inc., which operates out of the same office). GoogleCheckout.com, on the other hand, is registered to someone else via GoDaddy. So the question on everyone's lips is, is Google Checkout Google's answer to PayPal? That definitely seems to be the logical conclusion, and rumblings to that effect have been going on for months, if not a year or more. The timing is interesting, considering that just last week Yahoo! reportedly struck up a deal with PayPal's corporate parent eBay to handle transactions (among other things), and acquisition rumors have been going around. One thing's for certain: If Google did get into the "checkout" business, it would pretty much instantly be a force to be reckoned with.

Google has been accepting payments from a lot of people for awhile now, most notably AdSense advertisers and, more recently, people buying episodes of MacGyver on Google Video. Last week they added payments to Google Base, allowing sellers to collect money from buyers through Google, which some see as a shot directly across the bows of eBay and Craigslist. Nik Cubrilovic at TechCrunch has a review of the new payment system, which he describes as "extremely simple" and "Google fast." Google is working up to it slowly, so it's only available to a handful of sellers, but you can see some items for sale on Google Base by searching for "Xyzzy" (very cheeky, guys). You can also read Google's announcements about the new system at the Official Google Blog and the Google Base Blog.