Adding on to my previous post - let's talk about dimensioning! Dimensioning was improved in AutoCAD 2006 - check out some of the new improvements:
Varying dimension linetypes: Now you don't have to explode a dimension to change any of the individual dimension or extension lines to a different linetype! (Great for center lines)
Dimensioning arc lengths: Finally! If you've ever just wanted to dimension the length of a dimension your wish has been granted! The new DIMARC command comes to the rescue (complete with an arc length symbol if desired!)
Jogged dimensions: Dimensioning extremely large arcs can be a problem when the center point is off the screen, now you can specify a jog angle to properly dimension large curves.
Flipping dimension arrows: The new right-click shortcut menu offers the option of flipping your dimension arrow(s). Simply select near the arrow you want to flip and choose Flip Arrow from the right click menu.
New initial length symbol: AutoCAD 2006 provides a new symbol to indicate initial length (available from the Symbol list in the MTEXT right click menu)
Fixed length extension lines: Now you can create dimensions using extension lines with a consistent length, regardless of how far away from the part you select (so the extension lines might not even touch the geometry)
Stay tuned for more extremely cool features in AutoCAD 2006! (What do you think so far???)