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I was just reading through the Half-Life 2 storyline, and came across this detail from the conclusion of Opposing Force (during G-Man's final speech on the Osprey) that didn't seem that important, until now...
The G-Man (who had been watching him throughout the game) stands in front of Adrian and explains to him that his ability to "adapt and survive against all odds" rather reminds him of himself.
In light of what we're seeing in the Portal videos, perhaps this gives creedence to the possibility that the G-Man is the player character...