I don't know how others have incorporated Baby Signing time but my son (6 months) loves them. I do not let him watch TV or entertainment cartoons or DVDs so Baby Signing time is entertainment to him. When I need to shower, cook or talk on the phone I put on one of the DVDs. So he watches one for entertainment at least once a day and I sit with him to learn the signs and interact with him during the playing of the DVD. I use the signs for millk, cereal, water, apple, and just started eat and drink. I purchased mine from their website but have seen them on ebay and amazon.com.
Even if my son doesn't continue with sign language I feel the child parent interaction is valuable. My hope is that sign language helps us communicate while he is learning to talk. Maybe even ward off some toddler temper tantrums
Tracy