This has videos of rich math tasks being used in classrooms, and takes you through the preplanning, launch-explore-summarize of the lesson, and the reflection after the lesson. Student work samples from the actual videos are also available. It's a great resource for coaches and teachers for professional development.
this is an observational tool specifically for math coaches and administrators, to be used for the iPad or iPod touch. research based practices, and it's only $0.99 for a limited time.