I just did a tally of the styles in Autodesk Civil 3D 2006. I now counted a total of 83 styles. This is up from the 76 I counted in the 2005 version of the software.
The seven new styles are three Code Label Styles (Marker, Link, and Shape) and four that pertain to pipes and structures. They are Pipes Styles, Pipe Label Styles, Structure Styles and Structure Label Styles.
The first three new styles allow us to now control the display characteristics of Markers, Links, and Shapes in a Code Set. Then we can apply the Code Set to Subassemblies, Assemblies, Corridors, and Section Views.
The other four control the appearance of Pipes and their Labels, and Structures and their Labels.