I think there is much to what Yudkowsky is saying on the topic in this post:
http://lesswrong.com/lw/hh4/the_robots_ai_and_unemployment_antifaq/
He is arguing that the high levels of unemployment we see today are not due to technological progress but rather to the financial crisis.
If it takes 1 year to re-train a person to the level of employability in a new profession, and every year 2% of jobs are automated out of existence, then you'll get a minimum of 2% unemployment.
If it takes 4 years to re-train a person to the level of employability in a new profession, and every year 2% of jobs are automated out of existence, then you'll get a minimum of 8% unemployment.
If it takes 4 years to re-train a person to the level of employability in a new profession, and every year 5% of jobs are automated out of existence, then you'll get a minim...
There's a long article in this week's The Economist:
The onrushing wave
discussing the effect of changing technology upon the amount of employment available in different sectors of the economy.
Sample paragraph from it:
(There's a summary online of their previous book: Race Against The Machine: How the Digital Revolution is Accelerating Innovation, Driving Productivity, and Irreversibly Transforming Employment and the Economy)
What do people think are society's practical options for coping with this change?