There is now a new version (1.1) which includes support for iPad, and cylindrical panoramas.

QuickPano is a new iPhone app which lets you view cubic Quicktime VR panoramas directly on your iPhone. There are plenty of ways of producing cubic panoramas from SketchUp either directly from SketchUp (Cubic Pano Out plugin), or by exporting to a rendering package (e.g. Artlantis), and then creating a Quicktime VR file from the 6 cubic images. Now you can view this type of file directly on iPhone (iPad is in development). The neat part about it is the way QuickPano orients the panorama with the phones orientation and direction - this gives a real sense of the space to the SketchUp model especially when illuminated properly.
Here is the link, have a go! http://www.walkabout3d.com/Quickpano