If you haven’t used any macro before, you might want to start using it after you see what it can do! These are a couple of cool samples!
AutoCAD 2012: Editable UCS icon
An enhancement in AutoCAD 2012. Very useful if you work with UCS intensively. Now you can edit it directly using grips.
Controlling UCS for Angled Drawing and Local Coordinates
UCS is an AutoCAD productivity feature that we can use. You can use it to rotate your viewport or working with local coordinate.