Dark Forces II: Jedi Knight was one of the first bits of EU I was exposed to and thus a huge influence on my ideas about Star Wars as a whole, especially given the fact that I played it within a year or two of seeing the movies for the first time. The atmosphere and tone in that game is still closer for me to what Star Wars is supposed to feel like than almost anything else that's come out since. The lack of characters and locations from the movies made the galaxy seem much more open, and I think the way that dark Force users were handled here is a big part of why I'm so inclined to groan when I see every single bad guy with a lightsaber referred to as a "Sith" these days. I also think Yun's yellow lightsaber is why non-movie colors don't really bother me (the Darksaber from TCW is still the dumbest thing I've ever seen, though).

EDIT: What an historically significant post number.