Yesterday's Enterprise will always be my favorite.
Other top episodes:
Best of Both Worlds (best cliffhanger in television history)
Reunion
Inner Light
The Measure of a Man
The Wounded
Deja Q
Redemption
Silicon Avatar
Sins of the Father
I really liked the arc about Worf losing and then regaining his honor and the Klingon-centric stories in general. Gawron and K'Ehleyr are probably my two favorite recurring characters.
Plus K'Ehleyr was hotter than a ruptured plasma conduit.
