Part two of this tutorial can be found here: Curves, Part 2.
If you find this tutorial helpful, you might consider signing up for one of my workshops.
If you don't have broadband, you can download the video in full and watch it offline by right clicking the following link and choosing 'Save link as...': Curves Tutorial, Part 1. You will need Windows Media Player to play the downloadable video.
The video is provided for personal use, and may be distributed freely for that purpose only.