Second dropping the 'Casts' terminology. I would go with webcasts or streams. I would use google's keyword suggestion tool and find out what people are using to

Second dropping the 'Casts' terminology. I would go with webcasts or streams. I would use google's keyword suggestion tool and find out what people are using to search for webcasts, then use those terms. I think you'll loose initial users people who don't get the functionality with the drag and drop. I like your design, but for the intro tutorial, I'd simplify it greatly, using less graphics. It seems too much like a video I didn't choose, which I was ignoring at first. Good luck!