Vector based gradients
This tutorial is based on vectors made with the pen tool. You will need the basic knowledge of this tool for the shape, the rest is pretty much basic.
It was written for Adobe Photoshop 7.0, so later versions of ps should work well too.
Here's the direct links to the images that were used in the tutorial:
Final Result (4)
If you find anything wrong with it, like spelling or description and such, or just need help, don't be afraid to ask. I will help out whenever I can.