Having spent many thousands of hours developing my own shopping basket scripts in various scripting languages, I would advise others (and myself in future) to use a ready made Shopping Cart. In fact I would recommend Internet Marketers to outsource as much of the technical stuff as possible. You must put most of your effort into the creative and marketing side of your business that’s where the money is. Funny thing is that I see lots of formerly non-technical bloggers drawn into the DIY bog. Look rather at the shopping cart software provided by Ashop Commerce. Their shopping basket service requires no installation, interfaces to all major banks, all major services such as PayPal. They provide demos of the shopping basket side and just as importantly the administration side (the management of products and orders). They handle the tricky secure server side (secure transmission of creditcard details) of your ecommerce business as well. The age of DIY is coming to a close on the Web with service providers providing increasingly sophisticated shopping cart software.