By creating a custom brush and using clipping groups, you can create dazzling looking watermarks. This tutorial covers how to create a custom brush, make a clipping group and watermark your images for the Internet. To get the © copyright symbol, hold down the left alt key on your keyboard and type 0169 using the 10-key pad.
For further training, these are excellent eBooks that many people have recommended:
1. Understanding Post-processing
2. Guide to Post Processing and Photo Editing