I really prefer to use lava to light large areas. Do a glass column filled with lava every 7 blocks or so... Or carve out 1x1x2 channels in the ceiling, throw some lava up there, and toss a glass block underneath it. Or you can do something similar in the floor.
I don't like throwing torches all over the place. Looks kind of silly.
Though I'm going to try sticking them in the floor under a glass block... That might look nicer. Less dramatic than lava, but maybe nicer.