For the full series see http://tale2tell.com/premiere-pro-tutorials/

In this tutorial Andrew demonstrates one of the big new features for Adobe Première Pro CS6 – dynamic timeline trimming of edit points. Andrew shows how to enter the trim mode, to change to different types of trim tool, how to use the keyboard to trim and enter specific amount for detailed trimming as well as how to be able to select all the trim points on multiple layers of video so that you can go through your timeline without having to select different video layers