Nice. Good news for Merchants I guess.

"Since launching Google Checkout earlier this year, we've received a lot of feedback on the features you'd like to see. Coupons and discoun-t-s have been a big hit so far with buyers, but until now, it's been hard to create coupons without being an API wizard. Now, you can create coupons right from the merchant center. You can specify $-off discoun-t-s, %-off discoun-t-s, and specify such things as "one per customer," "new customers only," and so on. To help you better optimize your discoun-t-s and sales, you can even track usage of the coupons and get reports."

http://googlecheckout.blogspot.com/2006/10/new-feature-coupon-creator_27.html

I believe this came out about two months ago:
http://blogoscoped.com/archive/2006-08-15.html#n30

That was for Google Maps.

Yep, Totally 2 Different Services.