Ah, facebook...the distraction of it. TripAdvisor has created an addictive little application that you can install into your facebook profile, and lets you plot down to a city level, where you've been.
I like this version better than some of the earlier attempts, that would shade the entire country of Russia if you had only been to Moscow. This version lets you mark specific cities or states.
It tells me I'm up to 265 cities in 41 countries - I still reckon Scotland and Wales count as seperate countries, but this version does not. Anyway...as you can see, there's some vast empty areas on my map, which are yet to be explored, but are definitely on the list.