Position, Position, Position - being aggressive while in position means you have the opportunity to control the last bet that goes into the pot. So, when you're ahead, you can pump the pot, winning bigger pots than your opponent. When behind, you can check down, keeping the size of the pot under control.

Also, you have the chance to watch for weakness, and pick up the occassional pot. Position is valuable in a heads up match.

Catching Part of the Flop will usually put you ahead. Calling with something like middle pair will seldom lead to good results at a full ring game, but heads up catching any part of the flop can put you ahead of your opponent.

The All-in - of course patient opponents are in no hurry to win the match, but not all opponents are patient. Simply put, if you find yourself with the nuts, go all-in.

It may not work the first time, but players don't like the feeling of having to lay a hand that was contested down to an all-in bet. And if you've gone all-in before, the second time they are more likely to think they can catch you bluffing, and make the call.