Thanks, Joanne! This was my first time flipping a course, and I am happy with the results! But i will do it differently next time! Here are some lessons I learned (some will not be surprising if you are familiar with the education literature).

1) Videos should be short (<15 min..the shorter the better). Many of my videos were the same length as a traditional lecture (50-75 minutes). The students prefer several short videos in "topic chunks" rather than longer videos. less than 15 minutes is ideal (this is difficult and takes a lot of planning). My next mission is to make smaller topic videos to replace the longer ones, and link them together with the YouTube annotations features.

2) You can't just give out your old problem sets and work on them during class time. That's what I did at first, and I learned quickly that the really proactive students will get most of the problems done, while the less assertive students would not try very hard and leave everything for class time. This leaves you with an audience with diverse preparation and needs. In short, the proactive student are bored (and irritated) in class, while the less assertive ones are still barely keeping up. To fix this, I broke my weekly problem sets into daily in-class and out-of-class chunks. I assigned the easier problems for out of class (students watch the video and must finish 3-4 straightforward problems before class each day). In class, I gave them a more in-depth set to solve together. This let us focus as a group on solving the tougher problems, and encouraged enough pre-class prep. I even added some problems on top of the ones I had been assigning in my regular course format. Many of my in-class problems were from the VIPER community, while many of the out-of-class problems were direct from Miessler & Tarr or Shriver & Atkins texts.

3) The method I outlined in #2 worked like a charm! The students overall improved on the ACS inorganic chemistry exam. I have no other real assessment yet, but I am convinced that the students spent more time on problems overall with the flipped method, which is why they performed better on the exam. 

4) Expect some students to resist, so you've got to sell it to them on a regular basis. I tell my students as often as possible that we're doing class this way because research indicates that it is more bang for their buck (saves them time and helps them learn more). You'll certainly have at least a few grumbles from students who want to be lectured to, but don't let it discourage you.  

How I did this: Lectured for year 1 of the course (practice). Lectured/recorded using a tablet and Camtasia for year 2 (video production). Flipped and recorded some improved videos in year 3 (some improvement, used a light board a couple times). I plan to optimize the videos, problem sets, and adjust content in upcoming years.

I'm happy to answer any other questions! Good luck!