I recently completed the 3D rendered UI of KaleiDraw:
KaleiDraw is a simple OpenGL ES based kaleidoscope for iPhone, developed by friend and co-worker Giovanni Dal Negro aka GioFX.
All the 3D/2D graphics are my own work. GioFX is the author of the OpenGL ES based code. KaleiDraw, developed for iDiTeam, is based on a native Windows/Mac(Carbon) 3D engine, called Chimera, developed by GioFX in C/C++ and ported to iPhone(Cocoa).
I am a developer too (see, for example, MD5 Reader 2), and recently our collaboration leaded to the development of a new engine, partially based on Chimera. The aim is the production of an upcoming 3D breathtaking title for iPhone… stay tuned!