I believe we're on the brink of having two little language sponges on our hands.
Following directions is like a game right now. Overnight it seemed that saying, "Sophie, bring me your pants, please," or "Michael, let's read Going on a Bear Hunt," actually started making them stand up and go get stuff, and the specific stuff I mention. Sometimes the kids will be playing in their bedroom, starting to get into drawers or climb on the ottoman, and I'll say, "Come on, let's go out the door," to stop the mischeif, and they do it happily. I suspect this will change once they're two or three, but for now I'm marvelling at their intelligence and cooperation.
As far as actually speaking, they've been saying "kitty," mama," dada" and "hi" for a while. Now both are saying "more," ball," yeah," bye," and will repeat back sounds like "moo" and "vroom-vroom." They also enjoy mimicing intonations and melody, something Sophie seemed to do even as a newborn.
So I guess we better take a tip from Up All Night and cool it on the cussing.