i been having this oil leak lately thats been driving me nuts i changed the vc gaskets,oil pan gasket,oil cooler o-ring, and just got the intake gaskets changed i dont see oil leakage in the drive way anymore but when i was looking around the engine i notice this

http://tinypic.com/r/250k13s/5

this is the best picture i could get but theirs a puddle of oil down there.i know this is not normal so what could be causing this?