We've been trying to teach Troy sign language for a long time - probably at least 6 months.  He caught on to the milk sign really quickly, but he never really showed much comprehension of the others.

Until recently, that is.  As you can see in the picture above, he is absolutely enthralled with his Baby Signing Time video, and he is very good at making some signs.  The one he's making above is the "More" sign.  Hopefully he'll keep picking them up and be able to better communicate his needs to us.