MadMonkey: The rules for playing are the same. The scoring is the only difference. 1 for a win, 3 for a gammon and 5 for a backgammon.
The strategy for playing is different. Because gammons are worth so much you should play all-out for gammon. Take greater risks in building your home table and in attacking. Hit when you would normally hesitate.
(In case you've got so used to it that you never see it anymore, there's a link to the rules on every game page just after the name of the game type, eg. Backgammon (show rules). Finding a game if you haven't go one takes a few clicks via Menu: Statistics -> Running Games -> Backgammon). Triple Gammon isn't actually a game type so you'd have to find a backgammon game in a tourney with "triple" in the name. There's then a notification under the board. Backgammon (gambler104 vs. ajtgirl)