The CDC website is the main site I have always used as a physician to get the latest news on outbreaks of diseases. In particular with the spread of the H1N1 flu, this site has a wealth of information. They have a page dedicated to the H1N1 status here;

http://www.cdc.gov/H1N1FLU/

and they also have release dates of the vaccine to various states so you can see when your state is going to get the next shipment of the vaccine.

http://www.cdc.gov/h1n1flu/vaccination/vaccinesupply.htm

and here is a link to common safety questions about the vaccine.

http://www.cdc.gov/h1n1flu/vaccination/vaccine_safety_qa.htm