Find an expert to help install your car seat on the NHTSA's Website. To get your own car-seat installation inspected by a specialist, go to seatcheck.org or call 866-SEATCHECK.
Safe Kids Worldwide offers a car-seat inspection-station locator.
The NHTSA gives ratings and other info on 100 car-seat models.
Two similarly named organizations -- Kids in Cars and Kids and Cars -- provide safety information on their Websites.
The American Academy of Pediatrics publishes a comprehensive set of car-seat guidelines.