Tempo Tracks in Cubase 4

Audiotuts has a nice little tutorial on using hitpoints and marker tracks within Cubase 4 to create a changing tempo track. This is useful as it allows you to set up a tempo track that goes through multiple tempo changes over the course of a project. The use of hitpoints means you can 'sync up' these tempo changes to an existing piece of audio.
Could be useful for setting up a project for sound for film in which you would be likely to have varying tempos within your project.