On the way to church this morning DH were talking about how there's going to be two car seats in the back pretty soon

Which got us thinking... if you have two kids, which side do you choose to put each of their car seats on?
Right now DD's seat is on the right back seat because that way I can easily turn to see her and talk to her. But once the new baby comes is it better to put the newborn on the right, even though it's impossible to see them anyways with the rear facing seat? Or put the newborn behind the driver's seat and leave DD where she is?
I know it's going to be partial personal preference, but what have your experiences been with what works best?
Re: car seat placement? your opinion?
Our rule is touch the car or touch mommy until we start walking.
FWIW, I also did the same when it was just two.
All that being said, baby is behind the driver (and our baby has always been there). I get out, walk around, get LO (now J. and A.) out, they walk back around with me to get baby out.
We do what barnwife does, I always get DS out first and bring him to the other side with me to get the baby out, he stands between my legs and the car, or holds onto the driver's door handle next to me while I grab her. If it's freezing I unbuckle him and have him crawl through to get out DD's door.
DD (5 years old) from IUI in 2012
TTC 3rd and final!: IUI #1 in progress!