What steps will reproduce the problem?
1. go to https://code.google.com/p/parleysiphoneclient/
2. click "Install iPhone Client"
3. I get this: http://i39.tinypic.com/15y7mfr.png (The Item you've requested is not currently available in the US Store). I tried UK store too. Same story.
What is the expected output? What do you see instead?
I wanted to install the app. I couldn't.
What version of the product are you using? On what operating system?
I tried on OS X Lion (up to date) and on iOS 4.x (up to date).
Please provide any additional information below.