Honda generated a lot of excitement last year when it announced the 2010 Insight, a new dedicated hybrid. Could it unseat Toyota's Prius from the hybrid throne? But Toyota wasn't about to let this upstart go unchallenged, announcing an update to the current generation Prius, which has been in production since 2004. We got to see both production vehicles at the 2009 Detroit Auto Show, and set them against each other in a series of photos. Will the Insight bring fresh thinking to the hybrid space? Will Toyota sit on its laurels, or give the Prius the update it so urgently needs?