Business Week's Michael Mandel crunches the numbers and turns up some disturbing results. While recession has hit hardest at blue-collar workers, it is taking its toll on professional jobs as well. Unemployment for professionals overall increased by roughly four percent between August 2008 and April 2009. But the recession is hitting much harder at certain types of professionals. Computing and mathematical jobs (heavy on software engineers, computer scientists, and systems analysts) are down 9.3 percent; engineering and architectural jobs (two-thirds engineering) are down 10.3 percent; and "creative professional" jobs - working artists, musicians, dancers, entertainers, reporters, editors, writers, and other media types - are down 11.3 percent.