inverter or coolant pump trouble?

Hi All, 2006 prius with about 105K miles on it. Recently the dashboard lit up like a Christmas tree with all the warning lights. Battery fan runs non-stop as soon as the car is started and if driven, the gas engine never turns off. When it happened I was circling the neighborhood looking for parking. After about 5 minutes the car dropped out of drive and wouldn't go back in until I shut down and restarted. The battery still charges, and holds a charge when left parked. Anybody want to chime in as to what is most likely the culprit before I bring it in this afternoon? Dealer is 3.5 miles away (about 15 minute drive in Chicago). Am I risking further damage driving it in? Should I call for a tow?

Update : A check of the inverter coolant reservior shows that coolant is flowing. Ripples on the surface.