Taxed winnings in your country?

It's been a topic of great discussion how much you have to pay in taxes of your online poker winnings in Denmark. That's where I'm from.
Some people claim you have to pay normal income tax (60% believe it or not, lousy country!) others claim you dont have to pay at all if the pokersite is licensed in Europe. I dont know what to believe!

Anyway, this discussion got me interested! As far as I know americans don't have to pay anything. Is that correct? What about other countries? Say, England?

The more information I can get here the better!

Thanks in advance