Curves and Serpentines can be easily built with an Allan Block retaining wall. This video gives step-by-step instructions on building curved retaining walls.

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How to Build a Curved Retaining Wall

Autodesk Subassembly Composer Technology Preview for AutoCAD Civil 3D 2011 provides a powerful yet easy-to-use interface to visually modify or create complex subassemblies without the need for programming. Subassembly Composer is intended to be used by subassembly developers, but after watching our training videos anyone familiar with Civil 3D corridor modeling should be able to use it quite comfortably

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Autodesk Labs: Subassembly Composer for AutoCAD Civil 3D 2011 Edit a Retaining Wall