Google Checkout has a deal going where they'll give you 10$ toward a purchase of 10$ or more (not including s/h) at a participating vendor. I used my 10 bucks to pickup PM Dawn's greatest hits, which I've been wanting for a while, from CD Universe. Unfortunately, when I told Christine the good news, she did not know who PM Dawn is :-( ;-).
All in all, smooth experience, like PayPal. No complaints. Worth the 10$ off. And I'll happily use it again if I have the need and the vendor supports Google Checkout.
Or if Google gives away more free money ;-)