Common coolant leaks?

[chromehorseii]

What are the common coolant leaks on these trucks? Particularly the 4.6? I've been losing anti-freeze but not leaving puddles. I haven't had a chance to have a close look under the hood (actually read that as it is too damn cold out!!) and figured i would see if there is common places that tend to leak. If the truck didn't run so well i would almost say that i have a blown head gasket.

 

[IMINYOURCHAIR]

coolant cross over at the intake. water pump hose under the intake, heater core hose quick connects, I believe I've heard of an external head gasket coolant leak, front or rear heater core, the rear would drain outside though I imagine.

Here is an album of my leaks. The first shows that metal pipe I was talking about. Here is the intake, the crossover is the left most pipe and, when installed, is just behind the alternator

 

[chromehorseii]

Ugh, i hope my truck isn't leaking at the intake!! Not doing that job in the snow! lol