For general lighting, recessed fixtures on a dimmer provide soft ambient light that will let you see your popcorn without distracting from the movie. Another option is to install wall sconces or set track lighting to provide a glow along the room's walls.
Cabinets and shelving can be fitted with undercabinet or puck lights to illuminate electronics or collectibles.
Cove lighting in trey ceilings can provide an element of drama. Use a dimming system to control the mood of the lighting.
Proper lighting in a home theater room requires a mix of ambient and accent lighting to enhance your viewing, help prevent eyestrain and make the room practical to move around in after the movie.