Wireframe iOS design apps for iPad? Is there an app for iPad to assist in wireframe design for iPad and iPhone apps?

I don't mean actual development, just placing standard widgets and the things you usually do with photoshop and associated kits.
I've adored Briefs app since running across it a few years back. Nothing comes close to the power and design of this app. It for a long time was probably too powerful (sadly) to ever ship on the iTunes store - but the app has finally launched on the Mac and iOS App stores.


http://giveabrief.com


The trial Mac version is free as is the iOS app, Briefscase, which run the briefs. Heavy users of the app will want to buy the actual app on the Mac App Store.