Christopher Lydon, former New York Times man, former local TV news anchor, and one-time Boston mayoral candidate and his able crew have ventured into a compelling hybrid of radio and new media. Open Source combines broadcasts of Lydon's dialogues with smart people on wide-ranging topics with a blog/web site that encourages and involves the audience in content and commentary. For those needing a fix of Frank Rich, here is Lydon's recent chat with the man he calls "Jon Stewart for people who read."