The h1n1 strain was included in this year's vaccine the way any other strain would be. There are always multiple strains selected for the seasonal shot- it wasn't a new thing to do this because of the h1n1 threat. Once they decide which strains to use, then begins the process that takes months- incubating, extracting, and processing into the form needed to make vaccine.
eta> Emily got sick with h1n1 due to not being able to be vaccinated in time, and while Tamiflu reduced severity of the initial symptoms, she still ended up with a severe case of secondary bronchitis- the sickest she'd been in a year.