Britax car seats are some of the best available. These car seats have been a favorite of mine, and my little guy (at 16 pounds) is almost too big for his current infant seat.
You can find the Britax website here www.britaxusa.com for all your car seat and booster seat needs.
You can also enter the give away on Two of a Kind here: http://www.twoofakindworkingonafullhouse.com/2010/04/ride-safely-with-britax-advocate-cs.html
Good luck, but even if you don't win, you should consider purchasing a Britax for the best in car seat safety.