Overview: On tonight's programme, Paul Mason retraces the epic journey from the Oklahoma Dust Bowl to the Californian promised land taken by migrant workers the Joad family, which John Steinbeck described in his 1939 Great Depression novel The Grapes of Wrath. Paul's been finding out how it reflects the realities of America's current debt crisis. Read more here. General David Petraeus has been speaking to Newsnight about his time as Nato's commander in Afghanistan. The new Director of the CIA also talks to us about difficult recent relations between the US and Pakistan -- he tells Mark Urban both sides have "stepped back from the abyss after looking into it". Read more on Mark's blog. And Stephen Smith examines the research which claims that if you stay up to watch Newsnight after your partner has gone to bed, it's a sure sign your marriage is in trouble