Stage Directions has a round-up of some of the top theatrical special effects companies out there. They talk about the most challenging effects they have pulled off in a live performance, and how they work with a theater to plan it out and make it happen.
The Wire has a short history of ventriloquism which is quite fascinating, if a little bit creepy. I especially enjoyed the video of Ray Alan performing with his “Lord Charles” dummy, who was performing a ventriloquist act with his own, even smaller, dummy.
Pop Chart Lab has a great poster giving a stylistic survey of graphic design. It looks like a handy reference for when you want to check if your period piece has correct-looking paper props and ephemera.
Marvel Entertainment has started their own web video series on cosplay, and the first installment shows them planning and designing the costume they will build. And hey, looks like they are borrowing a costumer from the world of theatre to help them out. Go, theatre!