#1.)  Take advantage of their refill policies.  If you keep your Starbucks cup, you can get a coffee refill anytime for 50 cents.  If you bring in your own reusable cup, you get 10 cents off.  And if you bring a big one, sometimes some extra coffee.

 
#2.)  Get a Starbucks card.  Using their rewards card, you end up with plenty of free drinks and refills.

#3.)  Make a "poor man's latte."  Instead of ordering a latte, go SUPER ghetto and order an espresso over ice in a large cup.  Then go over to their "condiments" station and fill the rest of the cup up with their free milk.

#4.)  Don't order the bananas or bagels.  The pastries at Starbucks are pretty good and fairly priced.  But the bananas are more expensive than ones you'd get at a grocery store, and the bagels are known to be fairly low quality.

#5.)  Make your own iced drink.  When you order an iced drink, you get a lot less actual coffee or tea because the ice takes up so much space.  For a better value, you can order a hot drink . . . then order a cup with ice, and pour in your drink.