I started writing a minimal GLUT-compatible wrapper to run the OpenGL wikibook C++ samples using the Android NDK, and I'm making progress :) The Android NDK is getting nicer with Android 2.3, though it still feels less supported than Java apps (e.g. the resize events seem buggy and the keycodes header is incomplete...). Nonetheless, it's nice to be able to write C++ portable apps.

You can see how to use the wrapper, and how it works internally