A few months ago when I was tracing an 'overheating' problem (I think the radiator was the culprit) someone mentioned a leak that develops somewhere around the water pump.
I appear to be getting some leaking from this area.
However, when I was taking things apart to get to the oil pump, I may have loosened something I shouldn't. I'll have a look tomorrow or Tuesday to see if this is the case.
...I hope I don't have to take the whole damn thing apart again...