There are many different brands:
Inactivated Influenza Vaccine (Sanofi Pasteur), Influvac, Imuvac (Solvay) , Fluarix (GSK), Enzira (Wyeth), Agrippal, Begrivac, Fluvirin (Novartis), Intanza (Sanofi Pasteur MSD)...just to name a few.
They may contain traces of: formaldehyde & octoxinol 9, neomycin and polymixin, gentamicin, cetyltrimethylammonium bromide and polysorbate 80, sodium deoxycholate, kanamycin, diethyleter, betapropriolactone, nonoxynol 9, and thiomersal.
I was most worried about thiomersal, so we've picked a thiomersal free vaccine. Apparently those include:
Inactivated Influenza vaccine (split virion), Intanza (Intradermal, split virion), Agrippal (Surface Antigen), Begrivac (Split virion), Enzira (Split Virion), CSL Biotherapies Generic Influenza vaccine, Imuvac (Surface Antigen, inactivated, sub-unit), Influvac (Surface Antigen, inactivated, sub-unit), and Fluarix (Split virion, inactivated).