And if you do have your Google Checkout badge in you Adwords ads, how long did it take to appear? I'm pretty sure I've done everything required, had a couple sales, but it still says ineligable in my Checkout account - so I wondered if there's a waiting period or if I just missed something?
Just send an email to google. Nothing happened on my account for a couple weeks, I sent an email and the next day the button was working.