We had turned ds around, but....
I saw a thread here similar to this one several months ago that included a link that convinced me to face him rear as long as possible, i.e. as long as he doesn't exceed the weight/height limits for the Britax Roundabout we have.
Ds is now over 2y8mo and still facing rear, at just over 22lbs 33". His legs cross in front of him, which for kids is no biggie - they're much more flexible than we are. We have a mirror set up on the back of the car's seat so that he can see the driver and, when there are two adults in the car, one of us usually sits with him in the middle seat (we have a minivan).
Now, w/ baby #2 due any second, we had to figure out where to put the seats and where I should sit. If ds were facing forward, we'd put him in the back seat, w/ baby and I in the middle. However, ds is still facing rear, so he's still in the middle seat. The baby's seat is in the middle of the back seat w/ a mirror, and I've been sitting there when dh drives. I don't like the idea of baby#2 being so far away from me when I drive alone, but I'll plan my trips more efficiently/wait for dh when I can.
I wouldn't be surprised if the baby is in a convertible seat as well before ds is out of his (ds is tiny), so we may switch ds to forward-facing in the back seat at that time, as the Roundabout does not work in the middle of the back seat where there is only a lap belt. Or, we may buy a different convertible for him that will work rear-facing in the back and give the Roundabout to the baby. We'll see.
I don't know what we'll do if/when we have a third baby, as I don't think you're supposed to put two car seats in the middle seat - it's only seats two, and I can't sit in the middle of the back seat with only a lap belt. Maybe by that time we'll have a different minivan with separate seats in the middle and baby #3 will be in the middle of the back seat, with the other two in their own middle seats and me in the back.
What a book!