The CDC recently published Prevention and Control of Influenza with Vaccines Recommendations of the Advisory Committee on Immunization Practices (ACIP), 2010. It is available in pdf , which I prefer, and html .
It is 62 pages of dense reading, most of it understandable by someone without a medical or scientific background (me). If you have questions about just about any aspect of influenza or influenza vaccination, including their safety and effectiveness in various age groups, this is a great resource.
Vaccination opponents should carefully read it --- the better to know their enemy.
The CDC also has a recent powerpoint presentation at a September 2010 conference that discusses some of the same issues.