This provides an answer for one of the most often asked for features for oscommerce shops - to condense the checkout process. This makes for much happier customers and fewer problems. This addon has the following features:

• Real one page checkout where customer can enter shipping/billing information and view order totals and confirm the order. Eliminates the need of 4 extra pages from the checkout process.
• Works with vouchers/coupons module.
• Admin area to turn it on or off, optional auto-generation of user account password, turn on/off side columns to prevent users from navigating away from checkout
• Most billing/shipping modules are fully compatible
• No extra navigation/pages for customer to select billing/shipping addresses when they don’t want to use the default, they can add/edit their address right on the page
• Does not require JavaScript (but page will have to be refreshed in this case)