You might be familiar with OnOne, an app used for controlling tethered Nikon and Canon DSLRs remotely. Well I just thought I’d let you shooters out there know that it’s been updated to support the iPad, which in my opinion makes it much more useful. The larger UI makes for error-free adjustments, and the higher-resolution viewing area means you can check focus and other details more easily.
It’s not cheap: $50 for the iPad version and $20 for the iPhone version, but it looks like it might be worth the scratch. Check it out.