I have however started messing around with my old Project Vox renderer though; optimizing it a bit and making the shader a bit more realistic. Times like these I can really appreciate the work done by people like Wollay and Gavan Woolery. I've gotten the engine fairly fast now but I'm not happy with it at all since it takes over 1GB of memory to render a 400x400 map.
Will see if I can do anything about that. Here's a screenshot:
EDIT: VBOs are so last year. I rewrote the engine to use Display Lists that take up a hell of a lot less memory. I have a 1000x1000 map working using only about 300MB of memory.