When Archer gave T'Pol a big hug at the end of "These are the Voyages", I couldn't help but get a bit emotional.
After working side by side for all those years (and as a viewer watching for 4 seasons), it was great that Archer and T'Pol weren't afraid to let their emotions show and to express their appreciation for one another. It was probably my favorite moment of the finale.
And just a moment before that, T'Pol told Archer that he "look very heroic". And that prompted Archer to turn around and give T'Pol that hug.
And moments before that, T'Pol, on her own accord, rushed up to Archer to tidy him up by adjusting his collar, like a wife would do for her husband. That was a cute scene. Btw, I felt that T'Pol and Archer would have made a better couple than T'Pol and Tucker.
-----
There is another T'Pol/Archer scene that is memorable for me. T'Pol telling Archer, "I don't want you to die", after Archer had decided that he himself would pilot the suicide mission to destroy the doomsday weapon in "Azati Prime".
Later on, after Archer gave his goodbye speech and left on his mission, T'Pol went into the ready room and shed some tears. I thought T'Pol and Archer should have wound up being together instead of her and Tucker.