In several countries including the United States, cases of H1N1 flu have shown to be resistant to Tamiflu reports from AP, Fox News and other sources attest. There have been cases in Wales and Japan as well. How quickly the resistance will spread is an unknown. Virus strains tend to evolve quickly, so this is cause for concern.
I have had the immunization for H1N1 as well as the regular annual flu shot. Neither gave me any difficulties, even arm soreness was minimal. I hope my information helps someone to make an informed decision about getting the shot.