She can say Mama, and "ba" for ball, and "bu" for book. Just a little while ago she said "Mama ba" and pointed at the ball, which I then got for her. I don't know if that counts as her first sentence or not. :-)
Her favorite activity, for months and months, has been being carried around and pointing at things and grunting so we will say the name of the thing she's pointing at. Her favorite things to point at are ceiling fans, lights, clocks, and the outside. Oh, and the fish. And books. And everything else. She's just started demonstrating verbs to get me to say them, like drop and pickup and kick. Ow.