I will show you how i create very nice 3D logo.

Glossy 3D Logo

Open a new document:

500x500 pixels will be very good.
Then download the shape from the attachment area.
Load the shape

Glossy 3D Logo

Then select Custom shape tool, and draw the shape on your canvas

Glossy 3D Logo

When you drag the mouse , hold down the SHIFT key. In this way you can create a symmetrical shape
Go to Edit > Transform > Perspective and draw the corners of the shape until you have something like in the following image

Glossy 3D Logo

Hit the Enter key from your keyboard

Then press on CTRL+T ( free transform tool )

Then modify the vertical scale to 70%

Glossy 3D Logo

Do not forget to Hit Enter on your keyboard
Now comes the funny part
You need to follow my shortcuts very carefully

With this layer selected press on:
1 - CTRL+J ( this shortcut will duplicate the current layer )
2 - Up arrow key

repeat 14-15 times this steps from above and you will have something like me

Glossy 3D Logo

Select the top layer from your layer palette

Glossy 3D Logo

And add the following layer styles

Glossy 3D Logo

Glossy 3D Logo

Glossy 3D Logo

This layer style you can find it in Talk-Mania's Designer Pack

this is my result

Glossy 3D Logo

Now select the first layer we have created in this tutorial ( the layer above the background layer )

Glossy 3D Logo

For this layer please add the following layer styles

Glossy 3D Logo

Glossy 3D Logo

This is my final result

Glossy 3D Logo

I hope you like it. You can see in the following image some logo variation created in the same way
This set of logos are available only for VIP members

Glossy 3D Logo