I fully support gay marriage. If two people love each other, they should be able to show that love by marriage. No matter if they are the same love or not.
Not only do gay couples have the same rights as straight couples here in Norway (and Sweden, as Nym said), they also have the right to addopt a child or artifical fertilisation (if they are women, of course). Gay marriages are even done by the Church of Norway, even though some priests don't like it.
I don't think many countries have come this far. The US will probably take another 30 years to legalize it in all states, lol.