I recently participated in a Civil 3D User Group meeting in Ft. Myers, FL, organized by the Southwest Florida AutoCAD Professionals. We had some great discussions on Points, Surfaces, Styles (you can’t get very far in any Civil 3D discussion without mentioning styles), hardware recommendations, and basic configuration tips for sharing settings.
This group is very active and provides a great environment to share your knowledge. You will most likely pick up new tips and tricks from other users. The time spent attending AutoCAD User Group meetings is usually very worth while and usually does not cost anything.