Civil 3D 2010 SP2
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=13921667&linkID=9240698
Civil 2010 SP2
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=13915377&linkID=9240698
For those who utilize Vault for document and data management, a performance hotfix was also released:
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=13922196&linkID=9240698
Create a backup of all custom CUIx (menu customization) files before installing the update. These files are located in:
Microsoft® Windows® XP: Documents and Settings\
Microsoft Windows Vista:
Before applying this update, make sure that any customizations made to the user profile (such as, customizations made to the support file search paths, print file customizations, printer support file paths, redirections, custom template settings, and so on) are exported to a secure location, then imported and reapplied after the update has been successfully installed.