H1N1 is affecting a younger population than the usual seasonal flu. Older folk, in part because those over 65 have been exposed to the same constituents at least twice in the past, are less affected.
The H1N1 vaccine is no more dangerous to those vaccinated than the usual flu vaccine -- the only difference is the mixture of inactivated viruses contained in the vaccine. H1N1 has become sufficiently widespread in our population, at least in western Canada, that the chances of catching the H1N1 flu are much increased over the usual culprit. This, coupled with the age group it affects, has a considerable effect in our population -- rather than it being older (retired) folk, it is affecting children to middle age folk -- the working population. Should it affect a sufficiently large portion of the population, there is a very real possibility that many of the services we have come to expect, may not be available, simply because there are too few folk able to work & provide the needed services.
Vaccination programs such as we are seeing in Canada hope to garner enough vaccinated individuals in the population to slow or stop the spread of illness by what is called 'herd immunity': if most in a population are vaccinated, the likelihood of the whole of the population escaping illness is increased. Since some cannot be vaccinated (due to egg allergies, or other risk issues) ensuring those around them cannot spread the illness protects those who are not vaccinated.
THAT is the real reason for the current program -- not only does it protect those who get vaccinated, if enough of the population does get vaccinated, the spread is stopped.
DAvid