Update 2 for AutoCAD Civil 3D 2010 is out. You can find it using the link below.
http://usa.autodesk.com/getdoc/id=DL13921667
This update fixes over 40 issues, and it contains all the previous fixes from C3D update 1, AutoCAD update 1, and Map update 1. As always, be careful with any new software patches on production machines. A similar update is out for AutoCAD Civil 2010 also.