arved's weblog brought me to a wonderful application where you
can check which countries you've visited so far and the (web) application draws you a map where all the countries where you've been already are marked in red, and all others in green. Unfortunately, currently it's really slow, most likely because it's floating around in many people's weblogs, IRC channels and ICQ/Jabber discussions.
That reminds me that I should maybe travel around a little bit more. South America maybe?