www.naf-uk.eu - NAF are a primary manufacturer of Horse foodstuffs and supplements
I wrote an online shop for them. It is different to your average online shop because it is actually used by the retailers and when you enter the shop from a retailers website, it will keep track of which merchant you are actually buying from.
All the payments are taken by PayPal, so the site interacts closely with PayPal, and the site is easily navigateable to allow customers to build up a basket of goods and pay for them.
The site is written in Java/JSP and is backed by a Mysql Database. I setup the server, the database, wrote all the html/css and the Java.