The day after I posted that Lennon couldn't walk yet, she started to walk! She falls down quite a bit because when she tries to go too fast, but other than that she a really great walker.
We've been working on the sign for "more" for months now and she finally started using it after I gave her a little bite of cake. Now whenever she wants something she signs for more.
And, for your viewing pleasure, here is a video of LB dancing to one of her signing DVDs: