This week, we witness the amazing journey of YouTube as it turns yet another corner.

Last week, it was announced that YouTube has become the #2 search engine after Google (and Google owns it). Now, President-elect Obama has announced that he will publish weekly video messages via YouTube, starting with one this Saturday on his transition web site, Change.gov.

The comparison of Obama’s use of YouTube to Franklin Roosevelt‘s use of the radio and his fireside chats is unavoidable. Already, one of his transition co-chairs has posted a video outlining their goal of transparency and engagement:

No matter what happens, this seems to mark a major inflection point around technology, power, authority, and interaction.