Magento One Step Checkout
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One step checkout Magento extension developed by Indieswebs will help you improve the most important page of your site-your checkout page. One step checkout module simplifies your store’s checkout process and provides all details of a typical Magento checkout page that are spread across many tabs into a single page! The buyers can easily fill out all information without having to wait for each tab to load. Easy to implement and comfortable to use one step checkout module makes it simple to buy!

Full list of Features:

Checkout process is simplified from 6 steps to only one
Only one page to fill up all the checkout information and the checkout process is completed
One step checkout provides a better shopping experience to buyers
Separate the customer registration process from the checkout process which often confuses the buyers
One step checkout allows setting up default payment as well as shipping methods.
Allows easy configuration from admin
Order review at the end of page updates the order total dynamically through AJAX
Enable or disable newsletter subscription through configuration in backend
Disable fields like company, fax etc which are not that necessary to be displayed on checkout page