Last Friday I mentioned that Service Pack 1 would be out very soon. That got me thinking about the current updates that are available for Civil 3D 2006. There are three available.
The first to come out was Hotfix 1 released on May 10, 2005. This Hot Fix is for the English-language versions of Autodesk Civil 3D 2006 running on non-English-language operating systems.
The second, known as a Security Update, released June 8, 2005 is intended for every 2005 & 2006 Autodesk product. It prevents a local user from inappropriate access to another local user's computer.
The third was released last Wednesday (June 22, 2005). It corrects two problems with Customize User Interface (CUI) editing.
You should advise whomever is responsible within your organizations for these matters. The link above gets you to the Civl 3D "Updates and Service Packs" page.