Irrlicht 1.5.2 is out, it's mainly a bug fix release. To repeat what I just wrote on the Irrlicht
We just released an update to the 1.5 branch of the Irrlicht engine, version 1.5.2. It contains several updates and bugfixes, related to terrain smoothing, joystick support, OS/XCode updates and MS3D loader fixes. Happy downloading!