Creating Spree Extension - spree

Hey I have tried a lot creating spree extension , but after weeks efforts also I am not getting the desired outcome out of it. I have followed the spreecommerce website on extension tutorial but I didn't found it enough for a spree beginner.
Please suggest some good spree tutorial links.
Its urgent!!!

Simply in terminal in the dir of the spree store.
spree extension <nameofextension>

http://www.theroamingcoder.com/?q=node/11
http://blog.endpoint.com/2010/01/rails-ecommerce-spree-hooks-tutorial.html
see also Spree, Rails 3, and theming
http://www.spreecamps.com/devcamps-tutorial

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