The heater tap is just above that area and possibly has a leak if there is coolant pooling on the back of the head.
Check the hose clamps are tight, and that the hoses are OK and go from there.
There's no other coolant hoses near there that'll create a puddle in that area so I can't think of anything else that'll do it at the moment. Certainly isn't a major anyway by the sounds.
If the head was cracked you'd be loosing coolant hand over fist, it'll start and run like a bastard with heaps of white smoke out the arse end.
As a side thought, did you put anti-seize copper slip grease on the new glow plug threads? Just helps for next time they have to be removed.
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