OK, so as I poke around the creators of the very funny Bubble 2.0 video I posted last night, I discovered a couple of things:

1) They seem to be a group of former Stanford Fleet Street a cappella singers (thank you, Rebecca, for this tidbit.  It explains Jerry Cain appearing in the previous video).

2) There are other Richter Scale videos on Youtube

For example, here is one that is specifically about the Sub-Prime Mortgage mess.

You can subscribe to all of their videos on YouTube here.  Here is a link to their website.  Yes, they have a blog too.