This month he's been eating rice cereal from a spoon, and getting better and better at it every day.  He was rolling from tummy to back for several days, but for whatever reason hasn't done it again.  He's started playing in his exersaucer more, and will even sit in the jumperoo for a few minutes at a time, but he still likes to lay on his play gym mat, too.  He learning to purse his lips and spit, no bubbles really, just a lot of slobber.  No teeth yet.  He smiles and laughs easily at almost anything, like blowing raspberries on his belly:

...and singing "I'm a Little Teapot":

He definitely recognizes Mommy and her voice...turns his head when I walk into the room talking or randomly smiles at me from across the room (even when I'm not looking at him or talking to him).  It looks like he might be ready to regularly sleep through the night eight hours without waking up for his pacifier at all, but we'll wait until he's done it for a few more nights before we consider it the norm.  He still wears most of his 0-3mo clothes, but can wear some of his 3-6mo clothes now.