The key structural reason for the global financial crisis seems to be what Dan Alpert recently described as "global insufficiency of demand relative to an immense oversupply of labor and productive capacity."
The immense oversupply of labour is something Paul Mason briefly touches on in his latest book when he talks about "The Great Doubling" and how since 1989 the number of workers in the world doubled from 1.5bn to 3bn, halving the ratio of labour to capital.
From discussions I've had with people I get the impression Marx discussed this in part of Capital or the Grundrisse I've not yet reached, is that the case? There seems to be an argument that workers are now being permanently excluded from wage labour, I'm not sure that's what we're actually seeing and think the global economy will probably recover at some point in the future, but I'd be interested to hear what people think.
. I was going to say the same thing, I'm not sure there are any two marxists who fully agree on any one crisis.



Can comment on articles and discussions
The last but one episode of Novara was dedicated to the topic, but I'll need to listen to it yet again as most of it went over my head...
http://novaragroup.tumblr.com/post/27365875119/series-2-program-3-the-crisis-of-work
http://soundcloud.com/resonance-fm/novara-july-17th-2012
These two articles may also be of interest (I've no idea of their validity):
http://endnotes.org.uk/articles/1
http://endnotes.org.uk/articles/2