Redpoint Ventures announced that it had closed a new $400 million fund to invest in early-stage start-ups in the "social and mobile Internet, cloud computing and clean technology spaces." Is the closing a sign that things are looking up for the venture business after one of the toughest years in a dozen, with the amount VCs made in 2009 dropping 37 percent, according to a recent report? Who knows--but here's the skinny on the Redpoint IV fund..