I like watching videos of Eliezer talking and explaining things. So here is a list of videos I have discovered so far. I have not tried to make this list exhaustive. If you know of any more videos, please post them in the comments.

Eliezer Yudkowsky - Less Wrong Q&A Playlist

The main Eliezer Yudkowsky youtube playlist sorted after the publication date (not quality).

Here is also a playlist with videos featuring Nate.