As a mobile worker, I frequently get small payments in my PayPal account and would need to log in and check balances. The iPhone app is awesome, giving me instant alerts when someone has paid me without me having to login, even when travelling internationally. I see when clients pay, can process checks from the app(!), and even send responses if needed. This app is a must have if you sell items or run your business with PayPal.
Can wait for an expanded view version of the app for the iPad! 🙂
