All the time?
Players for national teams are usually picked by a team captain ( either self-selected, or it's someone who the community trusts ). With big communities, like Finland and Poland it's tough, with smaller ones, where the well-known players aren't in high numbers, it's easy.
If you feel you should've get selected, but you didn't... well, your fault for not being active in the clan scene ( good players are there, DUH ) or on IRC. If they don't know you, they don't select you, right?
Otherwise, some coverage:
The groups, after randomly drawn, look like this....
Group A
France
United Kingdom
Hungary
Portugal
Slovenia
Group B
Brazil
Czech Republic
Poland
Austria
Russia
Group C
Benelux
USA
Germany
Slovakia
Group D
Israel
Finland
Canada
Turkey
The toughest groups are A and C; group D has Euro-cup winners Finland and all the other laggy teams. Group B has our only south american contestants, Brazil, and the fearsome teams of Poland and Czeh republic.
The first match has already been played, Poland beat Brazil 2-0. ( With a tight match on Ash! )