Could be a front main oil seal, or an oil pan gasket. Hard to tell without putting the car on a lift and taking a peek. The front main is right behind the harmonic balancer, so this sounds like it could very well be the culprit. They are kind of a pain in the ass to change. It is also possible that the oil could be leaking from the valve cover gasket and dribbling down the front of the engine behind the timing belt cover (mine did this). The valve cover gasket is much easier to replace, so you might check this first. Good luck. Regards, Aaron