Cyril Crassin will be giving a talk at Siggraph 2009 on the subject of voxel raycasting and he has published a new short paper:
Beyond Triangles: Gigavoxels Effects in Video Games
Some screens of raycasted voxel scenes with the GigaVoxel technique here
I also found an interesting blog (via Timothy Farrar's blog) called EnterTheSingularity, which features a very interesting and in-depth post about the "perceived" latency of cloud gaming services:
The author (Jake Cannell, programmer on Mercenaries 2) has been thinking through the idea of cloud games quite well.