myStarbucks. Find all the nearby Starbucks locations with myStarbucks. See at a glance if the cloest store is actually open. Get directions. Call the store. This is an essential app if you are planning to become a Starbucks stalker. You can also browse the menu and find the nutritional information about those giant oatmeal cookies.
Starbucks Card Mobile. The Starbucks Card Mobile lets you check your Starbucks Card's balance and recharge the card electronically. And for a limited time, you get $5 free when you add $25 to the card via your iPhone. In certain California locations, you can even use the iPhone app as your Starbucks Card -- no need to pull the card out of your wallet, because you pay electronically using the phone. Cool -- just like Japan.
I'm actually somewhat surprised that Starbucks hasn't had its own apps till now. Oh well -- better late than never. And they're both free.
It also occurs to me that, depoending upon how addicted to coffee and scones you happen to be, you might want to add this to the list of seven essential apps for traveling with your iPhone.