I found this to be a pretty cool presentation. I have soem feedback for future posts which I hope will be helpful.
You fisrt explained what the application was supposed to do at the 5 minute mark. I think a brief overview of the capabilities sought at the begining would be more likely to get people staying through the end.
You might even consider showing the finished product at the begining just so people know what you are trying to accomplish. Secondly, you might jump direct to the code that matters such as the form and programing the jumplist. Third for those who are interested, you could do the house keeping parts like the using and variable setup. For me this would have made the presentation more impactful.
Thanks for showing of the features of the API.