Fledgling midwife on hiatus, Wife to B, mama to C (c/s 12/04) and S (12/07), m/c (3/12) and expecting another bean 6/13 .
I'm sure there is something out there! I'm in Canada, so the ones I suggested to my midwives' office might not be the right ones for you to use, but if you ask on www.car-seat.org for ones for your local area, you will get good suggestions w/ links to download them or order them! You don't need to register there to ask a question :)
But I haven't found anything good that covers everything- straps, ERF, coats, etc. I use the NHTSA flyer and a second one that has the recommendations and laws by age group on one side and the full list of CPS Techs in my area on the other side.
C.- WOHM, CPST Instructor, and all around busy Mama to A.- 02/04, I. 01/07,E. 09/10 and
expecting the surprise of our lives Fall 2012!