The Economic Policy Institute confirms what we already know:
Jobs shift from higher-paying to lower-paying industries
In 48 of the 50 states, jobs in higher-paying industries have given way to jobs in lower-paying industries since the recession ended in November 2001. Nationwide, industries that are gaining jobs relative to industries that are losing jobs pay 21% less annually. For the 30 states that have lost jobs since the recession purportedly ended, this is the other shoe dropping -- not only have jobs been lost, but in 29 of them the losses have been concentrated in higher paying sectors. And for 19 of the 20 states that have seen some small gain in jobs since the end of the recession, the jobs gained have been disproportionately in lower-paying sectors....
A story in the L.A. Times summarizes the findings for California:
Statewide, since the national recession officially ended in November 2001, the jobs that have been created are in industries that pay an average of 40% less than do those in which jobs have disappeared, the Economic Policy Institute said....
...California lost 127,000 manufacturing jobs and 55,000 jobs in the information sector from November 2001 to November 2003. Meanwhile, the leisure and hospitality sector gained 48,000 jobs, retail trade grew by 32,000 and health and education, which includes day-care teachers and low-wage hospital crews, grew by 65,000.
It's pretty much like that for every state in the union.
Here's the EPI's data chart (warning: it's a PDF) and here's the California story in graph form from the Times.