For me the reason for me to get the flu shot is because I work in healthcare, and so in the case of a flu epidemic, I am more likely to be exposed to the virus, and if I was to get sick myself it could have consequences for service provision and patient care (and that includes patients with other diseases, not just the ones with the flu). This already happened to me once... when I got flu immediately before I was supposed to start a weekend of night shifts. There was no way I was fit to work (I could hardly stand), and for the hospital it was a complete disaster as it left them short staffed at a time of day when there's far less staff around already.
Because of that, I have once had the flu shot since (the other years I've just not been able to attend at the right times and have missed it), and I was of course fine with it. I probably will get the regular flu shot this year, but I'm undecided on the swine flu vaccine, because of the fact it hasn't been as thoroughly tested (although it is closely based on the regular flu vaccine which has been). As far as swine flu goes, I have also been hearing stories from ex-colleagues now working in Australia, who, during their winter, saw a surprisingly number of YOUNG people who were seriously ill with swine flu to the point that they required intensive care and even ECMO (explained further up the thread). So, the belief that people hold that this virus is harmless if you're young and fit is untrue. A young fit person is however more likely to become seriously ill with swine flu than with regular flu.
I think every vaccine should be considered on an individual risk:benefit basis. If you have a low immune system, or diabetes or asthma, or are pregnant your risk from flu is higher, and the risk of flu probably outweighs risks of the vaccine. I do not personally think the risk from chickenpox justifies vaccination (and it is not even offered on the UK child vaccination schedule). I do not believe all children need to be vaccinated againts hep B (again, in the uk they aren't). But for measles, meningitis etc, it seems obvious to me that the risk of death and serious complications from these diseases outweighs the TINY risk of side effects from the vaccine (remember the story above referred to 1 in a MILLION!). And of course remembering, that for many of the side effects associated with vaccines according to the media and anti-vax groups there is NO MEDICAL EVIDENCE that those events (e.g. guillan-barre, autism) were even related to the vaccines.
But anyway, I'm personally undecided about the swine flu vaccine, but I think anyone who bases their decision on the vaccine on the video posted at the top is pretty silly.