An Illinois farmer checks the blades on his combine while harvesting corn last October. The value of the 2011 U.S. corn crop was more than $76 billion. Seth Perlman/AP hide caption

itoggle caption Seth Perlman/AP

Josh James co-founded the Web analytics site Omniture in 1996, then sold it to Adobe for $1.8 billion in 2009. Domo is James' latest startup. Derek Smith hide caption

itoggle caption Derek Smith

Oil workers on a drilling rig owned by Chesapeake Energy in Ohio. Students are flocking to the energy field. Gus Chan/The Plain Dealer/Landov hide caption

itoggle caption Gus Chan/The Plain Dealer/Landov

While parts of the U.S. economy struggle, other sectors are seeing growth. Here, job seekers talk with recruiters at a career fair in Manhattan last month. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images