Do'h/Woohoo! On the one hand, I've been robbed of one of my countries visited (as part of the U.K., Wales does not count as a separate country). I also can't remember if I've visited Bermuda or not so until I verify that, I can't count it. On the other hand, I've gained a country (I forgot that the Vatican City State is considered its own country even though I deliberately mailed some postcards from there just so I could use their postal system). That brings the grand total to
27 countries visited (12% of the world). I'll get one more in May when I hit Ireland (even though my second homeland of Scotland won't count).

Now you try!

(via upyernoz and waiting patiently for cherlina "we are the best and everyone else is the worst" to respond)