In case if you thought Unlimited Detail was cool:

Here's one of Ken Silverman's VoxLap demos
http://advsys.net/ken/voxlap/voxlap03.htm

VoxLap's a voxel based 3D engine developed by Ken Silverman in May 2000. This thing replaces polygons with voxels and by voxels I mean REAL VOXELS.

...also it's 1000 faster than Minecraft (tee hee)

Ken also released a sequel to VoxLap called PND3D, which brings in GPU acceleration, texture mapping and much more:
http://advsys.net/ken/voxlap/pnd3d.htm

I think polygons are way better...

I think I'll stick with polygons.

it cannot be compared on the same level but i think it's got potential.

Very interesting, i played the demo it was cool. Very fast.

@ghgames IKR! It's actually because, unlike other games including Minecraft, it uses real voxels instead of polygon cubes.

In more modern voxel engines, they work very differently to the standard polygon drawing because it's mainly calculated on the GPU in realtime, eliminating the workload upon the processor. It can look good, but there's a limit to what voxel drawing can do...