The Cliffs of Insanity

Here's the link to the MTV article: http://splashpage.mtv.com/2009/10/05/the-joker-blogs-offer-peek-inside-dark-knight-nemesis-therapy/

And the IMDb article: http://www.imdb.com/news/ni1049863/

Here's a sample of the article:

The video series, which currently includes 17 episodes posted over the last year, claims to be a collection of taped therapy sessions between Joker and Dr. Harleen Quinzel (destined to become the Joker's accomplice, Harley Quinn) conducted at Gotham's infamous Arkham Asylum. It also features an impressively spot-on impression of Ledger's freakishly scary Joker.