Make an on-the-fly podcast from yyour lecture series.
This is a small Website based on this node.js app with which you can very simply create your own on-the-fly podcast.
The idea is to upload a lecture video as mp4, the website converts it to mp3 and creates a RSS-Feed which you can feed into your podcatcher. If you upload a new lecture from the same lecture series, you can give the randomly created link to that series and the new lecture is added to your feed.