An interesting item I found in my most recent e-mail from APA Interact, a PAS report from 1949 detailing the titles and salaries of selected planning positions. The link also has a table to help convert a 1949 salary to a more current one. Interesting enough, most planning positions were paid more than the equivalent today.
Associate Planning Technician (Indianapolis)- $5,000 (1949)= $43,468 (2007)
An actual Planning Technician in Indianapolis today makes closer to the low $30's.
Here is the link to the report: