This tutorial to show how to use the Photoshot to create Vignetting effect on photos
I will be using Photoshop version 8.0:
1- Open your image with Photoshop.

2- Create a new layer by selecting New/Layer from Layer menu (SHIFT+CTRL+N).

3- Make sure to have the following color setting in the Tools

4- Fill the new layer with black (ALT+DELETE)

5- Use the Rectangular Marquee Tool (M) to draw a rectangular as the following

6- Select the Feather (ALT+CTRL+D) from the Select menu and enter a value between 100-200 pixels.

7- Hit Delete to delete the selected area

8- From the Layers palette reduce the Opacity slider value to the required level

And this is the final result












