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

Time remapping is hands-down the most powerful time changing effect in Première Pro and also great fun to work with once you know how to use it. In this tutorial, Andrew shows how to vary the time of a clip, how to ease that change, how to ease into a hold keyframe and then ease back out again. He then goes on to show how to make the whole clip carry on to play backwards and how to ease the change between playing one direction and the next