One of the new features you have probably noticed in AutoCAD 2012 is the new command line capabilities. When you start typing something in, AutoCAD automatically starts searching to help you finish the thought. Did you know you can configure how this works?
The new BLEND command in AutoCAD 2012 creates a tangent spline in between two entities. This can save you a lot of time compared to manually working the Spline command. You can pick lines, arcs, open splines/polylines, or elliptical arcs. After you pick the first entity, and hover the cursor over the second one, a preview of the new spline will be shown.
Before you select the first entity, one option is CONtinuity. Type in CON and then you can select from Tangent or Smooth. Tangent will create a degree 3 spline with tangency continuity to the selected objects at their endpoints. Smooth will create a 5 degree spline with curvature continuity to the selected objects at their endpoints.
As expected, the new spline entity will be created using the current properties (layer, color, etc). Are you already using this? Is this new to you? No need for it? Leave a comment with your thoughts. Read more about AutoCAD BLEND Command
There is a free bonus tool from Autodesk that provides drawing tabs. It is still available for download and even though the latest version if for 2010, it works in AutoCAD 2012 (tested with the 64-bit version).
The link above provides a single download that contains the necessary ARX files for 32-bit and 64-bit versions of AutoCAD 2007, 2008, 2009, 2010, 2011, and 2012. Read more about Drawing Tabs for 2012
This same information is posted at the bottom of my initial review of AutoCAD 2012, but it has proven to be very popular, enough that is deserves its own post. So here are the links to the free trial versions of AutoCAD 2012 and AutoCAD LT 2012, along with other information.