All major textures in the game were increased to 400%+ of their original pixels, sharpened, and had some detail added. Then new normal maps were generated to take advantage of the greater detail, which results in a significant improvement over the original graphics. This enjoys 0% compression files, which helps offset the fact that larger files requires more system resources.
A total ReTexture of the landscape textures and normal maps found in the landscape folder. The landscape textures in other folders were not altered (e.g. for caves). This is the total mod. If you have 2.0 you only need the altered files, so get the 2.0 -> 3.0 upgrade pack instead.