Here are some interesting videos and an article about these little pests; one guy says they come into houses on September 10.

http://www.wgal.com/video/28841194/detail.html

http://www.fox43.com/news/wpmt-stink-bug-invade-orchards,0,5880120.story

http://www.washingtonpost.com/national/health-science/stink-bugs-are-back/2011/08/06/gIQAmcKE1I_gallery.html#photo=1