A quick way to find out the length of a line (or multiple lines), use lengthen. Just type in lengthen on your command line (or whatever shortcut you have, mine is LN) and click on a line. It will tell you the length on the command line. The nice thing is you can click as many as you want (one at a time) without retyping the command. It also tells you the perimeter of polylines and the circumference of circles. I use it on ADT 2007.