Very simply vqmod which changes the Quantity field of a product in the admin from one to a thousand. It does this for new products.

Specially usefull for people who don't use the stock feature. If you leave quantity at 1 and a customer whants to buy 10 items, they will get an error. This extension prevents this.

Also usefull in combination with the "Subtract default no" extension: http://www.opencart.com/index.php?route=extension/extension/info&extension_id=6292