Joined: 23 Aug 06
15 May 07 10:14 pm
It surely depends on what you're trying to sell.
Japan, Germany, France must be pretty high on the list, but not all these people can read English.
Assuming your site is in English then I think the best countries to target would be the same as Mark suggests in the adwords lessons... Namely US, UK, NZ, Australia, Canada, Ireland, Hong Kong, South Africa, Singapore.
That's my guess