Pretty good, but two problems...
1. You rushed past the change "w.Content <- sp" at 5:30, and I missed it first 5 times I watched the video. (which is how many times I watched it, trying to work out why my program didn't work) Having a download of the code would have been VERY helpful.
2. I coudn't get it to work as an application in VS 2010. I had to use the interpreter (fsi).
Thanks. At least it's working now!