I didn't listen to the podcast, but just wanted to say that electric motorgliders are really coming around. I was out gliding with a friend recently and he broke the news that he has one of these babies on order:
http://www.alisport.com/eu/eng/silent2electro.htm
I can't wait to see it in person in a few short weeks when it arrives. I will take some pics and videos if anyone is interested.
[youtube]0wPHXk_YKNk[/youtube]