I recently got deferred rendering working after struggling with it for some time (my friend Tasky managed to find that I had a negative sign missing somewhere). Defuse lighting, ambient lighting, and specular lighting are now implemented and everything is progressing nicely.
Well, I got a chance to work on the engine a bit more and I’ve got some basic shader effects done but the major additions are terrain and procedural primitives (boxes/spheres). You can see a screen below – I wrote my name on the heightmap image. 
Special thanks to Machello for helping with an index algo for the spheres.
Sphere, terrain, and box - in that order.