Last Sunday, we happened to catch a new show in front of the castle, but I'm not sure how long they've been doing it. It's not listed on the Entertainment Times Guide, and I don't know what days and what times it normally runs, but the show we saw started around 1:45pm. There's a band that plays (I couldn't catch what they called themselves, but it sounded something like "The Berties".), and then Mary Poppins and Bert join them. They sing various songs from the film. Here's a picture of Mary and Bert with the band: http://www.colddeadfish.net/images/D...-06/mary01.jpg.
During one particular well-known song, there is even a visual aid: http://www.colddeadfish.net/images/D...-06/mary02.jpg.
Later in the show, Mary enlists children to help: http://www.colddeadfish.net/images/D...-06/mary03.jpg.
It was a lot of fun, and hopefully, Disneyland will start listing it in their Entertainment Guide.