Feel free to share with us anything you know about your team or the other teams. Great match-ups we have, but I can't make any predictions, don't even know on what surfaces the games will be played (still).
Here are the fixtures and the odds for the outright win:
Russia - Czech Rep 1.57 - 2.25 (could like the Czechs here, especially with Safin playing for Russia)
Germany - Spain 3.25 - 1.33 (could like the Germans here, especially after Ferrer's "great" current form)
Argentina - Sweden 1.04 - 10.0 
USA - France 1.15 - 4.5 
Davis Cup 1/4 finals
