This is running on my iPhone - much nicer on the iPad.
Untitled by
mbeganyi, on Flickr
Untitled by
mbeganyi, on Flickr
single finger to orbit
two fingers to pan
pinch to zoom
and it can transfer 'scenes' from SketchUp
no way to control layer visibility or section cuts straight out of SU, but you can take it to an intermediate software and set some of those things up.