Steve,
See attached image. (similar to David's but this is slopes, not elevations)
To create the table (in 2009 at least), go to Surfaces > Add Legend Table > S (for Slopes) and hit Enter for Dynamic. Then select where you want your table.
Make sure you have a surface style that has Slopes displayed and not Elevations (although it looks like you already have).
HTH
Nathan Bartholomew | CAD/Civil Designer | CPG New Zealand Ltd
WELLINGTON | AUCKLAND | NEW ZEALAND
A Downer EDI company
Civil3D 2009 | Version 4