OoooOh, BIIIIG subject here! If you want to download a decent pre-made shopping cart you can find lots of them over on
http://www.hotscripts.com . There's an awful lot, but the best are, unfortunately, commercial in design. PHP is best IMHO because it has more people supporting it... which is helpful when you have a problem.
Oh... and yes... the best shopping carts *WILL* need an appropriate database!
