Skala View is Good
I linked to Skala View when it first came out. Since then I’ve been using it all day every day.
Here’s what’s great about it: it connects directly to Photoshop CS5. Make a change in Photoshop and it appears on the phone.
I often work this way: my right hand is on my computer’s trackpad; my left hand holds my phone. As I make changes with my right hand, I watch what happens on the phone.
I feel like I should buy the app again every morning.