Personally, I love poker tournaments because the strategy it forces you to use as the blinds increase is much more exciting than the grind of live cash games.
One strategy I have used recently is that of positional raises with a tight aggressive image. You would be amazed at the success of my bluffs and the payoffs for my nut hands. Of course it all depends on the type of player you are up against to use this strategy. Some players will call in the early stages of an event no matter what image you present.