I also have a short video of Lucas turning to his name. He doesn't always turn, but at least vocalizes then when he hears his name.
I'd love it if he would start talking, but at least we're seeing some progress! Spoken communication has 3 big components - language, audition and speech. Lucas has been getting language input through sign since he was 3 months old, and auditory input for 6 weeks now. He's at least vocal and making "mmm" and "ahhh" in addition to lots of babbling. Words will come, I just have to keep reminding myself that "it's a marathon and not a sprint" (got that from another fabulous blog mom), and that his hearing age is only 6 weeks. We're seeing that Lucas's receptive language is really taking off (both through spoken language and sign), and he's learned a few more signs. Now I'm waiting for the all important first word...