IMO Italy is defenitely playing a bigger role in the world then Denmark or Belgium.
If you want include Belgium or Denmark then Switzerland should be defenitely on, (Bank, Chemicals, many many International Offices are based there) A list should always include Australia (then you have below the equator), also South Korea or inspiring South Africa (mandela, transition of white apartheit to democracy, huge mineral resources, regional powerhouse) is missing. I would also put Turkey on that proverbial list, (one of the few muslim allies with the west which makes big steps towards capitalism and it is close to becoming a potenital canditate for membership in the EU ),
I agree that Israel is playing a huge role in international affairs,
The list is of course biased towards where i am from, as Turkey, Italy or Switzerland is having a bigger impact on my life then Canada..
cheers
viggen