I changed out the thermostat a few weeks ago and everything seemed fine. Then last week there was a puddle of antifreeze on the driveway. It looks like its coming from the front of the engine and dripping off the oil pan, but its nearly impossible to see where without pulling off some parts. I've ruled out the water pump bearing, but nothing else. Is there a common leakage spot to check on first?

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma