This might be what finally motivates me to get a Blu-Ray player. The third season of Star Trek: The Next Generation was when the show finally jelled. Most of my favorite episodes come from that year: "Who Watches the Watchers?"; "Déjà Q"; "Yesterday's Enterprise"; "The Offspring"; "The Most Toys"; and the terrific cliffhanger, "The Best of Both Worlds".
(YouTube video: Star Trek: Next Generation - Season Three Blu-Ray trailer from CBS Home Entertainment. Turn off the lights, be sure you're in hi-def, go to full screen and crank up the sound.)