Android - OpenGL extensions available on different devices

I'm in the process of writing an OpenGL ES powered framework for my next Android game(s). Currently I'm supporting three different techniques of drawing sprites:

• the basic way: using vertex arrays (slow)
• using vertex-buffer-objects (VBOs) (faster)
• using the draw_texture extension (fastest, but only for basic sprites, i.e. no transforming)

Vertex arrays are supported in OpenGL ES 1.0 and thus in every Android-device. I'm guessing most (if not all) of the current devices also support VBOs and draw_texture.
Instead of guessing, I'd like to know the extensions supported by different devices. If majority of devices support VBOs, I could simplify my code and focus only on VBOs + draw_texture.
It'd be helpful to know what different devices support, so if you have an Android-device, do report the extensions list please. :)

String extensions = gl.glGetString(GL10.GL_EXTENSIONS); 

I've got a HTC Hero, so I can share those extensions next.

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Android - Tutorials and libraries for OpenGL-ES games

What tutorials and libraries are available which can help beginners to develop 2D and 3D games on Android using OpenGL-ES? I'm looking for tutorials which can help me learn OpenGL-ES, and I'm looking for OpenGL-ES libraries which can make life easier for beginners in OpenGL-ES.
Since Android is still small, I guess it may be help-full to read iPhone OpenGL-ES tutorials as well, as I suppose the OpenGL-ES functionality is much the same.

I have found the following useful information which I would have liked to share:
Android tutorials:

• DroidNova: Basic tutorial covering polygons, no textures
• anddev forum with some tutorials

Other Android OpenGL-ES information:

• Google IO lecture regarding games, not much OpenGLES
• The The Khronos Reference Manual is also relevant to have, but its not exactly the best place to start.

iPhone OpenGL-ES tutorials (where the OpenGl-ES information is probably useful):

• http://web.me.com/smaurice/AppleCoder/iPhone_OpenGL/Archive.html
• http://iphonedevelopment.blogspot.com/2009/05/opengl-es-from-ground-up-table-of.html

As for libraries which a beginner might use to get a simpler hands-on experience with OpenGL-ES, I have only found Rokon, which is recently started, thus has many holes and bugs. And it's gnuGPL licensed (at the moment) which means it cannot be used, if we wish to sell our games.

What else is out there?

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