Texture compression: each texture now uses much less space in the harddisk (80% less for loading screens) and generates mipmaps, resulting in much higher quality textures for in-game textures. This can be disabled from the Options tab if you run into any problems with the NVIDIA compression tool. The images below show the difference between uncompressed and compressed textures, click to see them at full size.

Added textures: Supercomputer, Mega Monitor, Arachnos poster, Sewer SG Base tileset.