Google AdWords has a strict no advertising rule for hard liquor, as they call it. You will not find ads for terms like rum, gin or vodka. Well... vodka searches now add a twist. Google has started to promote their vodka sellers with the top entry.
Before you get to the search results, there is a Google Checkout listing promoting various vodka sellers. Now that does seem like they are contradicting their own rules.
One hopes this was an oversight, since there are none for rum or gin as yet. Maybe vodka is just such a good Checkout seller that it has reached some number where it automatically gets the Checkout promo?
Hopefully someone at Google will publicly address this one. Right now, I would guess every vodka seller is signing up for a Google Checkout account. Not a bad mistake to make, if it generates new shopping cart customers.