stateofidleness,
I had something similar happen to me last month, in the drive through of Pizza Hut. In a matter of a few minutes, I managed to lose over half of the oil from my engine. When I went to pull up to the window, after the car in front of me left, I heard a loud ticking sound and that was when I noticed my oil light flashing. I pulled the car around to the back, parked it, and got out only to discover a 6 inch wide trail of oil leading all the way through the parking lot and out to the intersection. After verifying the obvious culprits, I had the car towed back to my house. At first, I thought that I blew a seal on the oil cooler, as it appeared that oil had sprayed from the that area down the driver side of the engine. But, once I got it up on jack stands and cleaned up a bit, I discovered that lower camshaft seal on the rear driver side of the engine was missing. There are a total of six of these seals, 3 on each side, with 1 front, 2 rear on the driver side and 2 front, 1 rear on the passenger side. Since your leak appears to be located more towards the center, it probably is something else, but it doesn't hurt to at least verify that these seals are not leaking or missing. Below, is a photo of the missing camshaft seal.
