I submit this as an entirely unscientific, poorly researched, and potentially misleading set of information. But here it is nonetheless. The Indeed.com web site offers a dynamic job growth trend chart based on search terms you enter.
I searched for job postings with “tech support” OR “technical support”. Note the absolute nosedive since January of 2009 through today, or at least as recently as July as the chart indicates. In and of itself it’s not surprising given the economic climate, however when compared to “customer service” search results beneath it stands in stark contrast.