Following from Jimi's mention of this site in another thread...

http://xhochy.org/lastfm-nationstats/

Post your stats NOW.

3990 United States
2516 United Kingdom
1150 Unknown
570 Germany
544 Japan
433 France
379 Canada
274 Romania
232 Finland
209 Sweden
199 Norway
176 Portugal
120 Australia
116 Korea
113 Italy
88 Belgium
85 Iceland
42 Denmark
35 Netherlands
32 Brazil
13 Jamaica
13 Switzerland
12 Ireland
7 South Africa
7 Israel
7 Austria
6 Russia
2 Ukraine
2 Bulgaria
2 Iran
2 New Zealand
2 Poland
1 Czech
1 Spain

That's a lot more varied than I was expecting.