A comprehensive list of features concerning Civil 3D 2007 has been posted by a friend of mine who is a licensed civil engineer in Minneapolis, Doug Benoit, P.E. [ICE].
Last week, Doug successfully completed Autodesk's Implementation Certified Expert (ICE) program for Civil 3D last week. Here's the blog he posted today with all the details.
Civil 3D 2007T Press Embargo Ended Today! So here is a list features and modifications!
Cheers!