The free BD Remote app lets users control their Sony BD equipment (no PS3 support, yet) via wifi from any iPhone or iPod Touch.
The app launches quickly and the interface is intuitive. Pairing the device is a simple three step process that should be easy for most users. There was a very slight lag with the TV interface, but the Blu-ray player I tested the app with was a pre-production unit.
Meta-data for media being played can be displayed on the iPhone along with related YouTube clips. Is the app revolutionary? No, but the app is free and adds good value for users who already have Sony BD devices.