Injuries and illnesses are a part of the game. Ask the Tampa Bay Lightning. Last year as they rolled to one of the worst records in the league, they lost over 300 man games to injuries and illness. The year they won the Stanley Cup the number was only in the 50s.
So far the H1N1 virus has attacked three players. Teams have been very good at quarantining players who have showed the signs and symptoms of the flu.
Capitals F Laing, Avalanche goaltender Budaj, and defensemen Smid from Edmonton have all contracted the nasty flu virus that has gripped the global atmosphere.
The only time in the history of the Stanley Cup that an illness has cancelled any portion of the season was the 1919 campaign that could not be completed because of the Spanish Influenza epidemic.
With the current longer schedule and format, it is unlikely that the finals could be effected by H1N1, as it is played out beyond flu season. However, a team could be rendered null in void for competition if they lose any number of players for an extended stretch through January and February because of the illness.