I was able to find this info on a how-to blog online. Hope it helps!

--
Install Apps That Aren’t Available in your Country’s iTunes Store.

Step 1: Launch the iTunes program and, if you are logged in, sign-out of your Apple iTunes account (Store – > Sign-out).
Step 2: Scroll down and click “Change Country” and select a country from the list.
Step 3: Now search for the name of the app that you are looking to install on your iPad, iPhone or iPod Touch. For this example, let’s try installing Adobe Ideas or iBook (both apps are available for iPhone and iPad but limited to US customers).
Step 4: iTunes will now require you to sign-in with your AOL, MobileMe or Apple ID. Instead of logging-in with your your existing Apple ID, click the “Create New Account” button and accept the “Terms and Conditions.”
Step 5: Use an email address that’s different from the one that’s linked to main Apple account. Under Payment Methods, choose “none” for the Credit Card section. You’ll then receive a verification email.
Step 6: Click the link in that verification email and you’re done.