I am flipping my staff professional development sessions also. Teachers watch training videos on their own. Then I use screen-o-matic to capture crucial points of a handout I distribute and assign mini homework lessons prior to meeting. Then when we all get together, I use a Google doc form to get quick responses to kick off table talk. Teachers seem to llike that they can go at their own pace of learning prior to meeting.
We have one teacher in our district who uses this with our gifted program students. Students use it a lot, but no one else in our district is there yet.